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Derivative Financial Instruments (Details)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2014
Carrying Amount [Member]
Euro-Denominated Note EUR350 [Member]
USD ($)
Dec. 31, 2014
Carrying Amount [Member]
Euro-Denominated Note EUR350 [Member]
EUR (€)
Net investment hedges [Abstract]        
Euro-denominated notes     $ 423.4us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= man_EuroDenominatedNoteEur300Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 € 350.0us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_DerivativeByNatureAxis
= man_EuroDenominatedNoteEur300Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Unrealized translation loss on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes (24.5)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax (60.6)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax    
Gain associated with forward contracts included in interest and other expenses $ 0.2us-gaap_DerivativeGainOnDerivative