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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Country | Dec. 31, 2013 | Dec. 31, 2012
Current [Abstract] |  |  |
Federal | $ 44.8 us-gaap_CurrentFederalTaxExpenseBenefit | $ (0.8)us-gaap_CurrentFederalTaxExpenseBenefit | $ 17.5 us-gaap_CurrentFederalTaxExpenseBenefit
State | 7.0 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 3.4 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 9.6 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Non-United States | 148.2 us-gaap_CurrentForeignTaxExpenseBenefit | 167.9 us-gaap_CurrentForeignTaxExpenseBenefit | 155.3 us-gaap_CurrentForeignTaxExpenseBenefit
Total current | 200.0 us-gaap_CurrentIncomeTaxExpenseBenefit | 170.5 us-gaap_CurrentIncomeTaxExpenseBenefit | 182.4 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred [Abstract] |  |  |
Federal | 53.2 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 21.0 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | (20.4)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State | (1.9)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 0.9 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 0.5 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Non-United States | 2.7 us-gaap_DeferredForeignIncomeTaxExpenseBenefit | (4.9)us-gaap_DeferredForeignIncomeTaxExpenseBenefit | 8.3 us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred | 54.0 us-gaap_DeferredIncomeTaxExpenseBenefit | 17.0 us-gaap_DeferredIncomeTaxExpenseBenefit | (11.6)us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision | 254.0 us-gaap_IncomeTaxExpenseBenefit | 187.5 us-gaap_IncomeTaxExpenseBenefit | 170.8 us-gaap_IncomeTaxExpenseBenefit
U.S. Federal statutory rate (in hundredths) | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Income Tax Reconciliation [Abstract] |  |  |
Income tax based on statutory rate | 238.6 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 166.4 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 128.9 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from [Abstract] |  |  |
Non-United States tax rate difference | 20.1 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 27.7 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential | 40.8 us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Repatriation of non-United States earnings | (10.1)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | (20.5)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings | (16.9)us-gaap_IncomeTaxReconciliationRepatriationOfForeignEarnings
State income taxes, net of Federal benefit | 2.9 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 3.2 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 6.7 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Change in valuation reserve | 5.0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (0.5)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 4.7 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other, net | (2.5)us-gaap_IncomeTaxReconciliationOtherAdjustments | 11.2 us-gaap_IncomeTaxReconciliationOtherAdjustments | 6.6 us-gaap_IncomeTaxReconciliationOtherAdjustments
Total provision | 254.0 us-gaap_IncomeTaxExpenseBenefit | 187.5 us-gaap_IncomeTaxExpenseBenefit | 170.8 us-gaap_IncomeTaxExpenseBenefit
Income tax benefit related to the CICE payroll tax credit | 2.8 man_IncomeTaxBenefitRelatedToCicePayrollTaxCredit | 5.9 man_IncomeTaxBenefitRelatedToCicePayrollTaxCredit |
Future Income Tax Benefits / (Expense) [Abstract] |  |  |
Repatriation of non-United States earnings | (53.1)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | (16.7)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |
Total future tax benefits | 59.5 us-gaap_DeferredTaxAssetsLiabilitiesNet | 115.7 us-gaap_DeferredTaxAssetsLiabilitiesNet |
Current tax asset | 52.2 us-gaap_DeferredTaxAssetsNetCurrent | 66.2 us-gaap_DeferredTaxAssetsNetCurrent |
Current tax liability | (20.6)us-gaap_DeferredTaxLiabilitiesCurrent | (4.4)us-gaap_DeferredTaxLiabilitiesCurrent |
Noncurrent tax asset | 54.0 us-gaap_DeferredTaxAssetsNetNoncurrent | 68.2 us-gaap_DeferredTaxAssetsNetNoncurrent |
Noncurrent tax liability | (26.1)us-gaap_DeferredTaxLiabilitiesNoncurrent | (14.3)us-gaap_DeferredTaxLiabilitiesNoncurrent |
Expirations of Net Operating Loss Carryforwards [Abstract] |  |  |
Valuation allowance, net operating losses | 103.4 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |
Pretax income of non-United States operations | 485.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 298.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign | 234.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Unremitted earnings of non-United States subsidiaries | 733.0 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |
Deferred Tax Liability [Abstract] |  |  |
Unremitted earnings of non-United States subsidiaries that may be remitted | 452.8 man_UnremittedEarningsOfNonUSSubsidiariesThatMayBeRemitted |  |
Deferred tax liability, undistributed foreign earnings | 53.1 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | 16.7 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |
Unrecognized Tax Benefits [Abstract] |  |  |
Tax benefits relating to unrecognized tax benefits | 1.4 man_TaxBenefitsRelatingToUnrecognizedTaxBenefits | 1.9 man_TaxBenefitsRelatingToUnrecognizedTaxBenefits |
Amount of unrecognized tax benefit that would affect the effective tax rate, if recognized | 29.4 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 30.4 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Interest and penalties related to unrecognized tax benefits | (0.6)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 6.3 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized tax benefits [Roll forward] |  |  |
Gross unrecognized tax benefits, beginning of year | 23.9 us-gaap_UnrecognizedTaxBenefits | 26.4 us-gaap_UnrecognizedTaxBenefits | 25.0 us-gaap_UnrecognizedTaxBenefits
Increases in prior year tax positions | 0.7 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 2.1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 5.8 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Decreases in prior year tax positions | (1.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (5.6)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (0.8)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Increases for current year tax positions | 2.2 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 3.4 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 3.1 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Expiration of statute of limitations and audit settlements | (2.6)man_UnrecognizedTaxBenefitsReductionsFromExpirationOfStatuteOfLimitationsAndAuditSettlements | (2.4)man_UnrecognizedTaxBenefitsReductionsFromExpirationOfStatuteOfLimitationsAndAuditSettlements | (6.7)man_UnrecognizedTaxBenefitsReductionsFromExpirationOfStatuteOfLimitationsAndAuditSettlements
Gross unrecognized tax benefits, end of year | 23.0 us-gaap_UnrecognizedTaxBenefits | 23.9 us-gaap_UnrecognizedTaxBenefits | 26.4 us-gaap_UnrecognizedTaxBenefits
Potential interest and penalties | 7.8 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 8.4 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 2.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Balance, end of year | 30.8 man_UnrecognizedTaxBenefitsIncludingPotentialInterestAndPenalties | 32.3 man_UnrecognizedTaxBenefitsIncludingPotentialInterestAndPenalties | 28.5 man_UnrecognizedTaxBenefitsIncludingPotentialInterestAndPenalties
Number of countries and territories in which the Company operates | 80 us-gaap_NumberOfCountriesInWhichEntityOperates |  |
U.S. Federal and Non-U.S. [Member] |  |  |
Expirations of Net Operating Loss Carryforwards [Abstract] |  |  |
2015 | 3.3 man_NetOperatingLossCarryforwardsExpirationWithinTwelveMonths / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
2016 | 7.4 man_NetOperatingLossCarryforwardsExpirationInTwoYears / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
2017 | 5.6 man_NetOperatingLossCarryforwardExpirationWithinThreeYears / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
2018 | 4.0 man_NetOperatingLossCarryforwardsExpiringWithinFourYears / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
2019 | 9.9 man_NetOperatingLossCarryforwardExpiringWithinFiveYears / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
Thereafter | 48.8 man_NetOperatingLossCarryforwardsExpiringAfterFiveYears / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
No expirations | 356.5 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
Total net operating loss carryforwards | 435.5 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = man_USFederalAndNonUSMember |  |
U.S. State [Member] |  |  |
Expirations of Net Operating Loss Carryforwards [Abstract] |  |  |
2015 | 3.8 man_NetOperatingLossCarryforwardsExpirationWithinTwelveMonths / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
2016 | 2.0 man_NetOperatingLossCarryforwardsExpirationInTwoYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
2017 | 6.8 man_NetOperatingLossCarryforwardExpirationWithinThreeYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
2018 | 6.0 man_NetOperatingLossCarryforwardsExpiringWithinFourYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
2019 | 0 man_NetOperatingLossCarryforwardExpiringWithinFiveYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Thereafter | 299.0 man_NetOperatingLossCarryforwardsExpiringAfterFiveYears / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
No expirations | 0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Total net operating loss carryforwards | 317.6 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Current [Member] |  |  |
Future Income Tax Benefits / (Expense) [Abstract] |  |  |
Accrued payroll taxes and insurance | 11.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / man_DeferredTaxesByClassificationAxis = man_CurrentMember | 17.9 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Employee compensation payable | 28.1 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation / man_DeferredTaxesByClassificationAxis = man_CurrentMember | 26.5 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Pension and postretirement benefits | (5.2)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits / man_DeferredTaxesByClassificationAxis = man_CurrentMember | (4.7)us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Repatriation of non-United States earnings | (53.1)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings / man_DeferredTaxesByClassificationAxis = man_CurrentMember | (16.7)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Other | 50.8 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther / man_DeferredTaxesByClassificationAxis = man_CurrentMember | 46.0 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Valuation allowance | (4.1)us-gaap_DeferredTaxAssetsValuationAllowance / man_DeferredTaxesByClassificationAxis = man_CurrentMember | (15.7)us-gaap_DeferredTaxAssetsValuationAllowance / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Total current future income tax benefits (expense) | 27.9 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / man_DeferredTaxesByClassificationAxis = man_CurrentMember | 53.3 us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Deferred Tax Liability [Abstract] |  |  |
Deferred tax liability, undistributed foreign earnings | 53.1 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings / man_DeferredTaxesByClassificationAxis = man_CurrentMember | 16.7 us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings / man_DeferredTaxesByClassificationAxis = man_CurrentMember |
Noncurrent [Member] |  |  |
Future Income Tax Benefits / (Expense) [Abstract] |  |  |
Accrued payroll taxes and insurance | 21.4 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | 19.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |
Pension and postretirement benefits | 65.7 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | 54.9 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |
Intangible assets | (124.7)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | (122.1)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |
Net operating losses | 129.7 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | 151.0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |
Other | 43.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | 70.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |
Valuation allowance | (103.8)us-gaap_DeferredTaxAssetsValuationAllowance / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | (111.4)us-gaap_DeferredTaxAssetsValuationAllowance / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |
Total noncurrent future income tax benefits (expense) | $ 31.6 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember | $ 62.4 us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent / man_DeferredTaxesByClassificationAxis = man_NoncurrentMember |

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