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Goodwill and Other Intangible Assets (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Goodwill [Abstract] |  |  |  |
Goodwill, Gross | $ 1,056.8 man_GrossGoodwill | [1] | $ 1,075.2 man_GrossGoodwill | [1]
Accumulated Amortization | 0 man_GoodwillAccumulatedAmortization | [1] | 0 man_GoodwillAccumulatedAmortization | [1]
Goodwill, Net | 1,056.8 us-gaap_Goodwill | [1] | 1,075.2 us-gaap_Goodwill | [1]
Accumulated impairment loss | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Finite-Lived [Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross | 367.0 us-gaap_FiniteLivedIntangibleAssetsGross |  | 411.7 us-gaap_FiniteLivedIntangibleAssetsGross |
Finite-Lived Intangible Assets, Accumulated Amortization | 241.4 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 276.2 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Finite-Lived Intangible Assets, Net | 125.6 us-gaap_FiniteLivedIntangibleAssetsNet |  | 135.5 us-gaap_FiniteLivedIntangibleAssetsNet |
Indefinite-Lived [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 151.0 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross |  | 151.3 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross |
Accumulated Amortization on Indefinite-Lived Intangible Assets | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets |  | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 151.0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  | 151.3 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |
Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |
Intangible Assets, Gross (Excluding Goodwill), Total | 518.0 us-gaap_IntangibleAssetsGrossExcludingGoodwill |  | 563.0 us-gaap_IntangibleAssetsGrossExcludingGoodwill |
Intangible Assets, Accumulated Amortization (Excluding Goodwill), Total | 241.4 man_IntangibleAssetsAccumulatedAmortizationExcludingGoodwillTotal |  | 276.2 man_IntangibleAssetsAccumulatedAmortizationExcludingGoodwillTotal |
Intangible Assets, Net (Excluding Goodwill), Total | 276.6 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 286.8 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract] |  |  |  |
Estimated amortization expense, remainder of the current fiscal year | 21.7 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear |  |  |
Estimated amortization expense, 2016 | 25.4 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |
Estimated amortization expense, 2017 | 22.4 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |
Estimated amortization expense, 2018 | 19.8 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |
Estimated amortization expense, 2019 | 15.8 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |
Estimated amortization expense, 2020 | 12.9 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |
Tradenames [Member] |  |  |  |
Indefinite-Lived [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 54.0 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [2] | 54.0 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [2]
Accumulated Amortization on Indefinite-Lived Intangible Assets | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [2] | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [2]
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 54.0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [2] | 54.0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [2]
Accumulated Impairment Loss | 139.5 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillImpairedAccumulatedImpairmentLoss / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |  | 139.5 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillImpairedAccumulatedImpairmentLoss / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Reacquired Franchise Rights [Member] |  |  |  |
Indefinite-Lived [Abstract] |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 97.0 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  | 97.3 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |
Accumulated Amortization on Indefinite-Lived Intangible Assets | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 97.0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  | 97.3 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |
Technology [Member] |  |  |  |
Finite-Lived [Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross | 0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  | 19.6 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Finite-Lived Intangible Assets, Accumulated Amortization | 0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  | 19.6 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Finite-Lived Intangible Assets, Net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_DevelopedTechnologyRightsMember |
Franchise Agreements [Member] |  |  |  |
Finite-Lived [Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross | 0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  | 18.0 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |
Finite-Lived Intangible Assets, Accumulated Amortization | 0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  | 18.0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |
Finite-Lived Intangible Assets, Net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |
Customer Relationships [Member] |  |  |  |
Finite-Lived [Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross | 357.4 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 359.9 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Finite-Lived Intangible Assets, Accumulated Amortization | 232.4 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 225.6 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Finite-Lived Intangible Assets, Net | 125.0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 134.3 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |
Other [Member] |  |  |  |
Finite-Lived [Abstract] |  |  |  |
Finite-Lived Intangible Assets, Gross | 9.6 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 14.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Finite-Lived Intangible Assets, Accumulated Amortization | 9.0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 13.0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
Finite-Lived Intangible Assets, Net | $ 0.6 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | $ 1.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |
[1] | Balances were net of accumulated impairment loss of $513.4 as of both March 31, 2015 and December 31, 2014.
[2] | Balances were net of accumulated impairment loss of $139.5 as of both March 31, 2015 and December 31, 2014.

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