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Derivative Financial Instruments and Fair Value Measurements (Details) In Millions, unless otherwise specified |  |  |  |  |  |  |  |  |  |  | 3 Months Ended |  |  |  |  |  |
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Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Mar. 31, 2015 Recurring Basis [Member] USD ($) | Dec. 31, 2014 Recurring Basis [Member] USD ($) | Mar. 31, 2015 Recurring Basis [Member] Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] USD ($) | Dec. 31, 2014 Recurring Basis [Member] Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] USD ($) | Mar. 31, 2015 Recurring Basis [Member] Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] USD ($) | Dec. 31, 2014 Recurring Basis [Member] Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] USD ($) | Mar. 31, 2015 Recurring Basis [Member] Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] USD ($) | Dec. 31, 2014 Recurring Basis [Member] Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] USD ($) | Mar. 31, 2015 Forward Contracts [Member] Not Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 Forward Contracts [Member] Designated as Hedging Instrument [Member] USD ($) | Mar. 31, 2015 Euro-denominated Note EUR350.0 [Member] USD ($) | Mar. 31, 2015 Euro-denominated Note EUR350.0 [Member] EUR (€) | Dec. 31, 2014 Euro-denominated Note EUR350.0 [Member] USD ($) | Mar. 31, 2015 Carrying Value [Member] Euro-denominated Note EUR350.0 [Member] USD ($) | Dec. 31, 2014 Carrying Value [Member] Euro-denominated Note EUR350.0 [Member] USD ($) | Mar. 31, 2015 Fair Value [Member] Euro-denominated Note EUR350.0 [Member] Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] USD ($) | Dec. 31, 2014 Fair Value [Member] Euro-denominated Note EUR350.0 [Member] Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] USD ($)
Net investment hedges [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 375.5 us-gaap_DebtInstrumentFaceAmount / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member | € 350.0 us-gaap_DebtInstrumentFaceAmount / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member |  |  |  |  |
Unrealized translation gain (loss) on net investment hedge included in accumulated other comprehensive (loss) income, net of taxes | 5.6 us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax | (24.5)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax |  |  |  |  |  |  |  |  |  | (0.1)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 5.7 us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member |  | (24.5)us-gaap_TranslationAdjustmentForNetInvestmentHedgeNetOfTax / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member |  |  |  |
Gain associated with forward contracts included in interest and other expenses |  |  |  |  |  |  |  |  |  |  | 0.2 us-gaap_DerivativeGainOnDerivative / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |  |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan assets |  |  | 85.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 81.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 85.7 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 81.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  |  | 0.2 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0.1 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0.2 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0.1 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |  |  |  |  |
Total assets |  |  | 85.9 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 81.5 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 85.7 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 81.4 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0.2 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0.1 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |  |  |  |  |
Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 375.5 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 423.4 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | $ 419.1 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 471.6 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition Cumulative adjustment resulting from gains and losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, commencing as of the designation date. Adjustment reported in equity as part of accumulated other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900 + Details
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