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Gain Loss On Derivative Instruments Net Of Income Tax Benefit Member Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Gain (loss) on derivative instruments, net of income tax benefit of $(0.7) and $(22.7), respectively Schedule of Weighted-Average Assumptions Used in Measurement of Benefit Obligation and Net Periodic Benefit Cost Defined Benefit Plan, Assumptions [Table Text Block] Sale of Stock Sale of Stock [Axis] Cash Flows from Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Percentage of diluted ownership interest, description Diluted Percentage Of Ownership Interest Description Diluted percentage of ownership interest, description. 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Dividends declared (in dollars per share) Common Stock, Dividends, Per Share, Declared No expirations Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration Revenue from Contract with Customer, Excluding Assessed Tax, Total Revenue Revenues from services Revenue from Contract with Customer, Excluding Assessed Tax Statement of Comprehensive Income [Abstract] Retirement Plan Name Retirement Plan Name [Axis] Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Income Taxes Income Tax Disclosure [Text Block] Decreases in prior year tax positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Schedule of Short-Term Borrowings Schedule of Short-Term Debt [Table Text Block] Designated as hedging instrument Designated as Hedging Instrument [Member] Instruments designated as net investment hedges Foreign currency forward contracts Foreign Currency Contract, Asset, Fair Value Disclosure Subscription Arrangement [Member] Cloud Computing Arrangements Income Tax Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] SEC Schedule, 12-09, Allowance, Credit Loss [Member] Allowance for Expected Credit Losses Cybersecurity Risk Management, Strategy, and Governance [Abstract] Schedule Of Earnings Per Share Diluted By Common Class [Table] Earnings Per Share, Diluted, by Common Class, Including Two-Class Method [Table] Restructuring Costs Costs Associated with Exit or Disposal Activities or Restructurings, Policy [Policy Text Block] Pension and postretirement benefits Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits Selling and administrative expenses Selling, General and Administrative Expense Selling and Administrative Expense Selling and administrative expenses Credit Facility Credit Facility [Domain] Carrying value, intangible assets Finite-Lived Intangible Assets, Net, Ending Balance Finite-Lived Intangible Assets, Net, Beginning Balance Net Finite-Lived Intangible Assets, Net Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Tradenames Trade Names [Member] Payout Levels (in units): Payout Levels In Units [Abstract] Payout levels. Total recognized in other comprehensive income/loss Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Document Period End Date Document Period End Date Cash used in financing activities Net Cash Provided by (Used in) Financing Activities In Lieu of Annual Cash Retainer In Lieu Of Annual Cash Retainer [Member] Deferred stock units issued in lieu of the annual cash retainer to non-employee directors. Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total Funded status, end of year Defined Benefit Plan, Funded (Unfunded) Status of Plan ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Discount rate for goodwill impairment test (as a percent) Alternative Investment, Measurement Input United States Federal and Non-United States U S Federal And Non U S [Member] The group of designated tax departments of the governments that are entitled to levy and collect income taxes from the entity in or outside their countries of domicile. Other liabilities Liabilities, Noncurrent [Abstract] Antidilutive securities excluded from the calculation of net earnings per share - diluted (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Carrying value Reported Value Measurement [Member] Restructuring Reserve, Total Reserve will be paid by end of period Balance, beginning of period Balance at end of year Restructuring Reserve Restructuring reserve APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Share-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Goodwill Goodwill Disclosure [Text Block] Consideration received from share-based awards Sale of Stock, Consideration Received on Transaction Unremitted Earnings Of Non U S Subsidiaries That May Be Remitted Amount of unremitted earnings of non-United States subsidiaries that may be remitted to the United States. Accumulated unremitted earnings of non-United States subsidiaries that may be remitted Accrued Liabilities, Current, Total Accrued liabilities Accrued Liabilities, Current Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Total provision Provision for income taxes Income Tax Expense (Benefit) Income tax expense on defined benefit pension plans and retiree health care plan Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax Income Tax Authority, Name Income Tax Authority, Name [Axis] Total cash consideration paid for acquisitions, net of cash acquired Total Cash Consideration For Acquisitions Net Of Cash Acquired Total cash consideration for acquisitions, net of cash acquired. Guarantees Guarantee Obligations [Member] Thereafter Net Operating Loss Carryforwards Expiring After Five Years For net operating loss carryforwards expiring after the fifth year following the balance sheet date. Trading Symbol Trading Symbol Business Combinations [Abstract] Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Total ManpowerGroup shareholders' equity Equity, Attributable to Parent Experis AG Experis A G [Member] Experis AG [Member] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2026 French Business Tax French Business Tax [Member] French business tax. Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Accounts Receivable, Contract Assets and Contract Liabilities Accounts Receivable Contract Assets And Contract Liabilities Policy [Text Block] Accounts receivable contract assets and contract liabilities. Other Productsand Services Other [Member] Products and Services, Other [Member] Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Plan assets Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets Supplemental Balance Sheet Information Assets And Liabilities Lessee Table [Text Block] Assets And Liabilities, Lessee [Table Text Block] Other Liabilities, Noncurrent, Total Other long-term liabilities Other Liabilities, Noncurrent Derivative Instrument Derivative Instrument [Axis] Cash consideration for acquisitions Payments to Acquire Businesses, Gross Other lease expense Other lease expense Variable Lease, Cost Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Cybersecurity Risk Management, Strategy, and Governance [Table] Health care cost trend rate assumed for next fiscal year (as a percent) Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year Goodwill, Total Goodwill Balance at beginning of period Balance at end of period Goodwill Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total Total unrecognized compensation cost, net of estimated forfeitures Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Selling And Administrative Expenses Excluding Goodwill Impairment Charges Selling And Administrative Expenses Excluding Goodwill Impairment Charges Selling and administrative expenses, excluding goodwill impairment charges Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Share Repurchase Program Share Repurchase Program [Axis] Uncommitted credit lines Uncommittedcreditlines [Member] Uncommitted credit lines Nature of Operations Nature of Operations [Text Block] Accrued liabilities Accrued Liabilities [Member] Discount Rates Measurement Input, Discount Rate [Member] Canada Subsegment. Canada Subsegment [Member] Canada Segment Reconciling Items Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Disposal Group Classification Disposal Group Classification [Axis] Measurement Input Type Measurement Input Type [Axis] Other Non Operating Income And Expenses [Table] Other Non Operating Income And Expenses [Table] Other Non Operating Income And Expenses. Total deferred Deferred Income Tax Expense (Benefit) Reduction in accrued interest and penalties related to unrecognized tax benefits Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Period Increase (Decrease) Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Period Increase (Decrease) Working Capital And Cash Member working capital and cash [Member] working capital and cash [Member] Geographical Geographical [Axis] Net earnings, net of tax, attributable to noncontrolling interests Interest And Other Non Operating Expenses Sum of interest income and expense, foreign exchange gains and losses and other miscellaneous non-operating income and expenses. Interest and other expenses, net Interest and other expenses, net Interest and other expenses, net Retirement Plan Tax Status [Domain] Retirement Plan Tax Status Leases [Abstract] Schedule of Changes in Restructuring Reserve Restructuring and Related Costs [Table Text Block] Other Other Debt [Member] Other long-term debt not otherwise identified. Reacquired franchise rights Reacquired Franchise Rights [Member] The rights we reacquired through business combinations that we had previously granted to the franchisees (acquirees) to use our trade name under a franchise agreement. Prior to 2009, these rights were considered indefinite-lived. Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax, Parent, Total Gain Recognized in OCI Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments and Tax, Parent Gain (Loss) Recognized in Other Comprehensive Income Use of Estimates Use of Estimates, Policy [Policy Text Block] Subsegments Subsegments [Axis] Proceeds from Issuance of Long-term Debt, Total Proceeds from long-term debt Proceeds from Issuance of Long-Term Debt Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] 2024 French Business Tax Rate, Year One French Business Tax Rate, Year One Exercise Price Range Exercise Price Range [Domain] Schedule Of Business Acquisitions By Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Exercise price range, upper range limit (in dollars per share) Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Expected dividend yield (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate Marketable Securities Marketable Securities, Policy [Policy Text Block] Security Exchange Name Security Exchange Name Dividends, Common Stock, Total Dividends Dividends, Common Stock Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of fair value hedges instruments Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Number of foreign plans using guaranteed insurance contracts Defined Benefit Plan Number Of Plans Using Guaranteed Insurance Contracts Defined benefit plan number of plans using guaranteed insurance contracts. Allowance for Loan and Lease Losses, Writeoff Bad debt write-off Cash flow hedge Cash Flow Hedging [Member] Cumulative Effect, Period of Adoption Cumulative Effect, Period of Adoption [Axis] Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Loss Contingency Nature Loss Contingency Nature [Axis] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Derivative, Contract End Date Forward agreement maturity date Proceeds from Divestiture of Businesses, Net of Cash Divested, Total Total cash impact of the acquisition Proceeds from Divestiture of Businesses, Net of Cash Divested Lessee, Operating Lease, Liability, to be Paid, Year Three 2027 Carrying value of franchise right Indefinite-Lived Franchise Rights Weighted-average grant-date fair value of options granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Maximum Maximum [Member] Short-term borrowings and current maturities of long-term debt Short-term Borrowings And Current Maturities Of Long-term Debt [Member] Short-term Borrowings And Current Maturities Of Long-term Debt Total liabilities and shareholders’ equity Liabilities and Equity Interest And Other Income Expenses Net [Text Block] The entire disclosure for interest income and expense, foreign exchange gains and losses and other miscellaneous non-operating income and expenses. Interest and Other Expenses, Net Defined Benefit Plan, Expected Future Benefit Payment, Year One 2025 Intangible Assets, Gross (Excluding Goodwill), Total Gross Intangible Assets, Gross (Excluding Goodwill) France France Subsegment [Member] France Subsegment [Member] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Valuation Allowances And Reserves Deductions For Charges To Other Accounts Amount of decrease in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to accounts other than costs and expenses. Reclassifications and other Shares Issued (in shares) Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Issued In Period Number of shares under an equity-based award plan, other than a stock option plan, that were issued during the reporting period. Supplemental Cash Flow Information Supplemental Cash Flow Information Supplemental Cash Flow Information [Abstract] Total liabilities measured at fair value Financial Liabilities Fair Value Disclosure Retirement Plan Sponsor Location Retirement Plan Sponsor Location [Domain] Euro Notes due in 2026 Euro Notes due in 2026 [Member] Euro Notes due in 2026 Retirement Benefits [Abstract] 2025 French Business Tax Rate, Year Two French Business Tax Rate, Year Two Earnings Per Share, Diluted, Total Net earnings (loss) per share - diluted Net earnings per share - diluted Earnings Per Share, Diluted Leasehold Improvements Leasehold Improvements [Member] Northern Europe And APME Northern Europe and APME. Northern Europe and APME [Member] Insurance contracts Insurance Contract [Member] This category includes ownership interest in insurance contracts. Number of businesses disposed Number Of Businesses Disposed Number of businesses disposed. Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized Tax Benefits [Roll Forward] Foreign Exchange Contract [Member] Foreign currency forward contracts Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Total current assets Assets, Current Cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash inflow Notes due June 2018 Notes Due June2018 [Member] Notes Due June 2018 [Member] Weighted average of daily historical volatility of Company's stock price, weight (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Finite-lived: Finite-Lived Intangible Assets, Net [Abstract] Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Foreign currency forward contracts Reportable subsegments Reportable Subsegments [Member] Gross unrecognized tax benefits, beginning of year Gross unrecognized tax benefits, end of year Unrecognized Tax Benefits Realized Investment Gains (Losses) Realized Investment Gains (Losses), Total Realized Investment Gains (Losses) Payments of contingent consideration for acquisitions Payment for Contingent Consideration Liability, Financing Activities Share-based payment award vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Percentage of goodwill over fair value of reporting unit Percentage Of Goodwill Over Fair Value Of Reporting Unit Percentage of goodwill over fair value of reporting unit. Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Beginning Balance Options outstanding, shares (in shares) Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Entity Filer Category Entity Filer Category Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Unvested, aggregate intrinsic value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested French business tax rate French Business Tax Rate French business tax rate. Draw on revolving credit facility Draw on revolving credit facility Draw on revolving credit facility Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Defined benefit pension plans and retiree health care plan, net of income taxes of $1.7, $(3.7) and $2.2, respectively Notes Due June 2026 Notes due June 2026 Notes Due June2026 [Member] Notes Due June 2026 Percentage of diluted ownership interest, if underwriter exercises of overallotment option in full Diluted Percentage Of Ownership Interest On Exercises Of Overallotment Option In Full Diluted percentage of ownership interest on exercises of overallotment option in full. Total shareholders’ equity Accumulated other comprehensive loss Balance, beginning of period Balance, end of period Equity, Including Portion Attributable to Noncontrolling Interest Derivative, Notional Amount Forward agreement notional amount Current Fiscal Year End Date Current Fiscal Year End Date Accounting Policies [Table] Accounting Policies [Table] Accounting policies. Payment for contingent consideration liability, financing activities Business Combination, Consideration Transferred, Liabilities Incurred Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Noncontrolling Interests Non- controlling Interests Noncontrolling Interest [Member] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Equity Method Investment, Realized Gain (Loss) on Disposal, Total Non-cash gain on disposition of previously held equity interest Equity Method Investment, Realized Gain (Loss) on Disposal Minimum fixed charge coverage ratio Fixed Charge Coverage Ratio Minimum Minimum fixed charge coverage ratio as per restrictive covenant terms. Accounts payable Accounts Payable And Accrued Temp Payroll Accounts payable and accrued temp payroll. Share-based Payment Arrangement, Noncash Expense, Total Share-based compensation Share-Based Payment Arrangement, Noncash Expense Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Related and Nonrelated Parties [Axis] Net Investment Hedging Net Investment Hedging [Member] Goodwill, Foreign Currency Translation Gain (Loss) Currency impact Entity Registrant Name Entity Registrant Name Indefinite-lived Intangible Assets, Major Class Name Indefinite-Lived Intangible Assets, Major Class Name [Domain] 2019 Acquisitions Excluding Manpower Switzerland Two Thousand And Nineteen Acquisitions Excluding Manpower Switzerland [Member] Two thousand and nineteen acquisitions excluding Manpower Switzerland. Quarterly Data (Unaudited) Quarterly Financial Information [Text Block] Gross profit Gross profit Gross Profit Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Net Earnings Per Share Earnings Per Share [Text Block] Entity Emerging Growth Company Entity Emerging Growth Company Weighted-average common shares outstanding - basic Weighted Average Number of Shares Outstanding, Basic, Total Weighted average shares - basic Weighted Average Number of Shares Outstanding, Basic Stand-by letters of credit Standby Letters of Credit [Member] Schedule II VALUATION AND QUALIFYING ACCOUNTS SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Weighted-average interest rates Short-Term Debt, Weighted Average Interest Rate, at Point in Time Increases in prior year tax positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Period Ending December 31, 2023 Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Indefinite - Lived Intangible Asset Impairment Test Indefinite - Lived Intangible Asset Impairment Test Indefinite - lived intangible asset impairment test Common stock, authorized (in shares) Common Stock, Shares Authorized Share Repurchase Program Share Repurchase Program [Domain] Estimated useful lives Property, Plant and Equipment, Useful Life Summary of Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Other Americas Other Americas Reportable Segment [Member] Segment information related to the Americas excluding the United States reportable segment. Accumulated Gain Loss Net Cash Flow Hedge Parent Member Loss On Long Term Purchase Commitment Comprehensive [Member] Loss On Long Term Purchase Commitment Comprehensive [Member] Employee compensation payable Accrued Salaries Current And Accrued Vacation Current Accrued salaries current and accrued vacation current. Transfers Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan Write-Offs Write-offs SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Debt Disclosure [Abstract] Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference Granted (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Amortization of Intangible Assets, Total Intangible asset amortization expense Consolidated amortization expense related to intangibles Amortization of Intangible Assets Exercise Price Range Exercise Price Range [Axis] Prior service cost (credit) recognized in accumulated other comprehensive loss Prior service cost Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Other Deferred Tax Assets, Tax Deferred Expense, Other Change in unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease), Total Income tax expense on pension plan settlement Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax Derivative Instruments, Gain (Loss) [Table] Income Tax [Line Items] Income Tax [Line Items] Income tax. Outstanding (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Range One [Member] Stock options outstanding and exercisable with the lowest exercise price range $75-$80 Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total Provisions Charged to Earnings Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Prepaid expenses and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Defined Benefit Plan, Plan Assets, Category Defined Benefit Plan, Plan Assets, Category [Axis] Long-Lived Assets Long-Lived Assets Total projected benefit payments Defined Benefit Plan Expected Future Benefit Payments Total The total amount of the aggregate benefits expected to be paid. Share-Based Payment Arrangement [Abstract] Deferred Tax Assets, Capital Loss Carryforwards Capital loss carryforwards Debt, Current, Total Short-term borrowings and current maturities of long-term debt Debt, Current Translation Adjustments Allowance For Doubtful Accounts Receivable Translation Adjustments Allowance for doubtful accounts receivable translation adjustments. Funded Status at End of Year Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract] Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total Issuances under equity plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Subsegments Subsegments [Domain] Goodwill impairment charges Goodwill, Impairment Loss Impairment Charge Goodwill impairment charges Schedule of Plans With Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] Components of Accumulated Other Comprehensive Loss, Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Amounts Recognized Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract] Settlements Settlements Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 2021 Acquisitions Excluding Ettain Group [Member] 2021 acquisitions excluding Ettain Group [Member] 2021 acquisitions, excluding ettain group. Cybersecurity Risk Role of Management [Text Block] Accounting Policies [Abstract] Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Statutory Plans Statutory Plans Member [Member] Statutory Plans [Member] [Member] Foreign currency translation Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax. Income Tax Disclosure [Abstract] Increases for current year tax positions Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Shareholders’ Equity Equity, Attributable to Parent [Abstract] Non-cash gain on disposition of previously held equity interest Gain on disposition of remaining controlling interest Business Combination Non Cash Gain On Disposition Of Previously Held Equity Interest Business combination non cash gain on disposition of previously held equity interest. Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease), Total Derivatives used in Net Investment Hedge, Net of Tax, Period Increase (Decrease) Adjustments on derivative instruments, net of income taxes of $22.0, $(17.4) and $11.1, respectively Notes Due June2027 Member Notes Due June2027 Member Notes Due June 2027 Disposal Group Name Disposal Group Name [Domain] Statement [Table] Statement [Table] Summary of Property and Equipment Property, Plant and Equipment [Table Text Block] Adjustment for Long-term Intercompany Transactions, Net of Tax, Total Adjustment for Long-Term Intra-Entity Transaction, after Tax Translation adjustments on long-term intercompany loans, net of income taxes of $0.0, $0.0 and $(0.8), respectively Italy Italy Subsegment [Member] Italy Subsegment [Member] Real estate funds Real Estate Funds [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Wtd. Avg. Exercise Price Per Share Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Disposal Group Classification Disposal Group Classification [Domain] Securities Act File Number Entity File Number Segment Data Segment Reporting Disclosure [Text Block] Switzerland Subsegment [Member] Switzerland Switzerland Subsegment [Member] Change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Revenue from Contract with Customer [Abstract] Settlements Settlements Settlement of lump sum payments Defined Benefit Plan, Plan Assets, Payment for Settlement Performance period range Performance Period Range Performance term considered in granting performance share units. Earnings Per Share [Abstract] Services transferred at a point in time Transferred at Point in Time [Member] Operating Leases Operating Lease Assets And Liabilities Lessee [Abstract] Operating Lease, Assets And Liabilities, Lessee [Abstract] Change in Plan Assets Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Effect of other share-based awards Non Stock Option Awards [Member] Non stock option awards. Statement of Financial Position [Abstract] Reconciliation of Changes in Benefit Obligations and the Statement of Funded Status of Plan Schedule of Defined Benefit Plans Disclosures [Table Text Block] Interest Expense, Total Interest expense Interest Expense, Operating and Nonoperating Interest expense Initial Public Offering IPO [Member] Operating profit (loss) Operating profit Operating Income (Loss) Amortization expense related to capitalized software cost Capitalized Computer Software, Amortization Long-Term Debt, Maturity, Year One 2026 Expected volatility (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Corporate Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Entity Shell Company Entity Shell Company Defined Benefit Plan, Expected Future Benefit Payment, Year Four 2028 Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable, Ending Balance Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable, Beginning Balance Options exercisable, shares (in shares) Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable Effective interest rate (as a percent) Debt Instrument, Interest Rate, Effective Percentage Entity Tax Identification Number Entity Tax Identification Number Retiree Health Care Plan Retiree Health Care Plan [Member] Retiree Health Care Plan. Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax, Total Reclassification of currency translation adjustment to income related to disposition of partially held equity interest (see Note 4) Reclassification of foreign currency translation adjustments related to previously held equity interest Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax Fair Value Measurements Fair Value of Financial Instruments, Policy [Policy Text Block] Entity Current Reporting Status Entity Current Reporting Status Exercisable (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Change in Benefit Obligation Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Operating Unit Profit Loss Operating unit profit (loss) is equal to segment revenues less cost of services and branch and national headquarters operating costs. This profit measure does not include goodwill and intangible asset impairment charges or amortization of intangibles related to acquisitions, interest and other income and expense amounts or income taxes. Operating unit profit (OUP) Amortization of net loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Allowance for deferred tax assets Revenues Revenue from Contract with Customer [Policy Text Block] Geographical Geographical [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Cloud Computing Arrangements Policy Cloud Computing Arrangements Policy Cloud Computing Arrangements Period considered to determine expected volatility of stock price Period Considered To Determine Expected Volatility Of Stock Price Period considered to determine expected volatility of stock price. Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Total Expired or cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period Range Two [Member] Stock options outstanding and exercisable with the second exercise price range $81-$89 Repayments of Long-term Debt, Total Repayments of long-term debt Repayments of Long-Term Debt Accumulated amortization on intangible assets Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Repurchases of common stock Repurchases of common stock Treasury Stock, Value, Acquired, Cost Method Summary of Unrecognized Tax Benefit Activity Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Foreign-Derived Intangible Income deduction Effective Income Tax Rate Reconciliation, FDII, Amount Business Acquisition Business Acquisition [Axis] Noncontrolling interest transactions Noncontrolling Interest Transactions Noncontrolling Interest Transactions City Area Code City Area Code Reclassification, Comparability Adjustment [Policy Text Block] Reclassification Schedule of Plans With Projected Benefit Obligation in Excess of Fair Value of Plan Assets Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets [Table Text Block] Outstanding letters of credit Letters of Credit Outstanding, Amount Total current liabilities Liabilities, Current Derivative Contract Derivative Contract [Domain] Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Goodwill from Acquisition for income tax purposes Business Acquisition, Goodwill, Expected Tax Deductible Amount Gain On Interest Rate Swap, Net Of Income Taxe [Member] Gain On Interest Rate Swap, Net Of Income Taxe [Member] Gain on interest rate swap, net of income taxes of $0.2 and $0.3, respectively Severance and employee related costs Acquisitions and integration costs Business Combination, Integration Related Costs First, second, and fourth quarters First Second And Fourth Quarters [Member] First, Second, And Fourth Quarters [Member] Currency exchange rate changes Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Interest and Other Expenses (Income), Net Interest and Other Expenses (Income), Net Interest And Other Income Expenses Net [Member] Interest and other (income) expenses, net. U.S. Federal statutory rate (as percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Shares authorized to be repurchased (in shares) Share Repurchase Program, Authorized, Number of Shares Goodwill and Other Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Cross-currency swaps Cross Currency Swaps Asset Fair Value Disclosure Cross-currency swaps asset fair value disclosure. Local Phone Number Local Phone Number Netherlands Business Unit Netherlands Business Unit [Member] Netherlands business unit. 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Schedule of Long-Lived Assets by Geographical Region Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Shares remaining authorized for repurchase (in shares) Share Repurchase Program, Remaining Authorized, Number of Shares Cash Divested from Deconsolidation Impact to cash resulting from sales of subsidiaries North America [Member] North America Schedule of Fair Value of Plan Assets By Asset Category Fair Value, Assets Measured on Recurring Basis [Table Text Block] SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Charged to Other Accounts Other Nonoperating Income (Expense) [Abstract] Property and Equipment Property, Plant and Equipment, Net [Abstract] Company Sponsored Plans Company Sponsored Plans [Member] Company Sponsored Plans [Member] Other Non Operating Income Expense [Line Items] Other Non Operating Income Expense [Line Items] Other non operating income expense. Payout Achieved Over Performance Period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Achieved Over Performance Period Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Achieved Over Performance Period Long-Term Debt, Maturity, Year Three 2028 Loss contingency Loss Contingency, Estimate of Possible Loss Total operating lease liabilities Total operating lease liabilities Operating Lease, Liability Accrued payroll taxes and insurance Accrued Payroll Taxes, Current Measurement Frequency Measurement Frequency [Axis] Non-United States Plans Foreign Plan [Member] Deferred Tax Assets, Operating Loss Carryforwards, Total Deferred tax asset on net operating losses Deferred Tax Assets, Operating Loss Carryforwards Tax loss carryforwards Commitments and Contingencies Commitments and contingencies (Note 15) 2025 Net Operating Loss Carryforwards Expiration In Two Years For net operating loss carryforwards expiring within the second year following the balance sheet date. 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Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Entity Small Business Entity Small Business Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Credit spread (as a percent) Debt Instrument, Basis Spread on Variable Rate Schedule Of Indefinite Lived Intangible Assets [Table] Intangible Asset, Indefinite-Lived [Table] Debt Debt Disclosure [Text Block] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Net (gain) loss Net loss (gain) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net Gain (Loss) Reclassified from AOCL into Income Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement, Total Purchases, sales and settlements, net Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement Intangible assets Deferred Tax Liabilities, Intangible Assets Revenues Revenues Revenues, Total Accrued Expenses [Member] Accrued Expenses. Foreign Currency Transaction Gain (Loss), before Tax, Total Foreign exchange loss Gain (Loss), Foreign Currency Transaction, before Tax Value added taxes payable Sales and Excise Tax Payable, Current Shares repurchased (in shares) Treasury Stock, Shares, Acquired Ettain Group Member Ettain Group [Member] Ettain Group [Member] Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised, Total Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Proceeds from share-based awards Total intangible assets Intangible Assets, Net (Excluding Goodwill) [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total Acquired interests Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Credit Facility Credit Facility [Axis] Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration] Revolving Credit Agreement Five year credit agreement Revolving Credit Facility [Member] Discount rate - service cost Discount Rate Service Cost Discount rate service cost. 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