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Accumulated Other Comprehensive Income (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income [Abstract]    
Foreign currency translation $ (26.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 239.5us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax
Translation loss on net investment hedge, net of income taxes of $(16.4) and $(36.7), respectively (24.5)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax (60.6)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax
Translation loss on long-term intercompany loans (73.4)us-gaap_IntercompanyForeignCurrencyBalanceAmount (73.6)us-gaap_IntercompanyForeignCurrencyBalanceAmount
Unrealized gain on investments, net of income taxes of $3.7 and $1.6, respectively 16.7us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 11.5us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Accumulated other comprehensive (loss) income (155.2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 82.2us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Translation loss on net investment hedge, taxes (16.4)man_AccumulatedOtherComprehensiveIncomeTranslationLossOnNetInvestmentHedgeTax (36.7)man_AccumulatedOtherComprehensiveIncomeTranslationLossOnNetInvestmentHedgeTax
Unrealized gain on investments, taxes 3.7man_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax 1.6man_AccumulatedOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Defined Benefit Pension Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plans (52.1)man_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAfterTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
(39.7)man_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAfterTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Defined benefit plan, taxes (30.1)man_AccuulatedOtherComprehensiveIncomeDefinedBenefitPlansTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
(21.8)man_AccuulatedOtherComprehensiveIncomeDefinedBenefitPlansTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Retiree Health Care Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plans 4.5man_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAfterTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedBenefitPostretirementHealthCoverageMember
5.1man_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeAfterTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedBenefitPostretirementHealthCoverageMember
Defined benefit plan, taxes $ 2.4man_AccuulatedOtherComprehensiveIncomeDefinedBenefitPlansTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedBenefitPostretirementHealthCoverageMember
$ 2.7man_AccuulatedOtherComprehensiveIncomeDefinedBenefitPlansTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DefinedBenefitPostretirementHealthCoverageMember