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Derivative Financial Instruments (Details) In Millions, unless otherwise specified | 12 Months Ended |  |
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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 |  |  | $ 423.4 us-gaap_NotesPayableFairValueDisclosure / us-gaap_DerivativeByNatureAxis = man_EuroDenominatedNoteEur300Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | € 350.0 us-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 | $ 0.2 us-gaap_DerivativeGainOnDerivative |  |  |

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- Definition Amount of increase in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- 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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