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v2.4.1.9

Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 CountryandTerritory Office | Dec. 31, 2013 | Dec. 31, 2012
Basis of consolidation [Abstract] |  |  |  |  |  |
Ownership interest to qualify for equity method, maximum (in hundredths) | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |  |  |
Ownership interest to qualify for equity method, minimum (in hundredths) | 20.00%man_EquityMethodInvestmentOwnershipPercentageMinimum |  |  |  |  |
Carrying value of equity method investments | $ 132.3 us-gaap_EquityMethodInvestments |  | $ 140.2 us-gaap_EquityMethodInvestments |  | $ 85.3 us-gaap_EquityMethodInvestments |
Unremitted earnings from equity method investments | 77.4 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions |  | 74.4 us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions |  |  |
Revenues and receivables [Abstract] |  |  |  |  |  |
Franchise fees | 25.4 us-gaap_FranchiseRevenue |  | 24.4 us-gaap_FranchiseRevenue |  | 23.9 us-gaap_FranchiseRevenue |
Deferred revenue - current | 35.5 us-gaap_DeferredRevenueCurrent |  | 48.5 us-gaap_DeferredRevenueCurrent |  |  |
Deferred revenue - non-current | 0 us-gaap_DeferredRevenueNoncurrent |  | 10.0 us-gaap_DeferredRevenueNoncurrent |  |  |
Allowance for doubtful accounts [Abstract] |  |  |  |  |  |
Bad debt expense | 18.9 us-gaap_ProvisionForDoubtfulAccounts |  | 24.1 us-gaap_ProvisionForDoubtfulAccounts |  | 29.2 us-gaap_ProvisionForDoubtfulAccounts |
Advertising costs [Abstract] |  |  |  |  |  |
Advertising expenses | 25.7 us-gaap_AdvertisingExpense |  | 22.3 us-gaap_AdvertisingExpense |  | 27.2 us-gaap_AdvertisingExpense |
Goodwill [Abstract] |  |  |  |  |  |
Goodwill, Gross | 1,075.2 man_GrossGoodwill | [1] | 1,090.9 man_GrossGoodwill | [1] |  |
Accumulated Amortization | 0 man_GoodwillAccumulatedAmortization | [1] | 0 man_GoodwillAccumulatedAmortization | [1] |  |
Goodwill, Net | 1,075.2 us-gaap_Goodwill | [1],[2] | 1,090.9 us-gaap_Goodwill | [1],[2] | 1,041.3 us-gaap_Goodwill | [2]
Nature of operations [Abstract] |  |  |  |  |  |
Number of offices worldwide | 3,000 man_NumberOfOfficesInWhichEntityOperates |  |  |  |  |
Number of countries and territories | 80 man_NumberOfCountriesAndTerritoriesInWhichEntityOperates |  |  |  |  |
Accumulated goodwill impairment loss | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  | 513.4 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Income approach weight for goodwill impairment for certain reporting units (in hundredths) | 75.00%man_IncomeApproachWeightForGoodwillImpairmentForCertainReportingUnits |  |  |  |  |
Market approach weight for goodwill impairment for certain reporting units (in hundredths) | 25.00%man_MarketApproachWeightForGoodwillImpairmentForCertainReportingUnits |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 411.7 us-gaap_FiniteLivedIntangibleAssetsGross |  | 405.3 us-gaap_FiniteLivedIntangibleAssetsGross |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 276.2 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  | 247.9 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |  |  |
Finite-Lived Intangible Assets, Net | 135.5 us-gaap_FiniteLivedIntangibleAssetsNet |  | 157.4 us-gaap_FiniteLivedIntangibleAssetsNet |  |  |
Indefinite-lived [Abstract] |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 151.3 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross |  | 151.7 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross |  |  |
Indefinite-Lived intangible assets, Accumulated Amortization | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets |  | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 151.3 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  | 151.7 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill |  |  |
Intangible Assets (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill), Total | 563.0 us-gaap_IntangibleAssetsGrossExcludingGoodwill |  | 557.0 us-gaap_IntangibleAssetsGrossExcludingGoodwill |  |  |
Intangible Assets, Accumulated Amortization (Excluding Goodwill), Total | 276.2 man_IntangibleAssetsAccumulatedAmortizationExcludingGoodwillTotal |  | 247.9 man_IntangibleAssetsAccumulatedAmortizationExcludingGoodwillTotal |  |  |
Intangible Assets, Net (Excluding Goodwill) | 286.8 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 309.1 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |
Amortization expense related to intangibles | 33.4 us-gaap_AmortizationOfIntangibleAssets | [3] | 34.1 us-gaap_AmortizationOfIntangibleAssets | [3] | 36.7 us-gaap_AmortizationOfIntangibleAssets | [3]
Future amortization expense [Abstract] |  |  |  |  |  |
2015 | 29.5 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths |  |  |  |  |
2016 | 26.3 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo |  |  |  |  |
2017 | 23.0 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree |  |  |  |  |
2018 | 20.2 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour |  |  |  |  |
2019 | 15.9 us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive |  |  |  |  |
Marketable securities [Abstract] |  |  |  |  |  |
Available-for-sale investments market value | 0 us-gaap_AvailableForSaleSecurities |  | 0 us-gaap_AvailableForSaleSecurities |  |  |
Ownership interest in our Swiss franchise (in hundredths) | 49.00%us-gaap_MinorityInterestOwnershipPercentageByParent |  |  |  |  |
Swiss Franchise Investment Market Value | 200.9 man_SwissFranchiseInvestmentMarketValue |  | 204.2 man_SwissFranchiseInvestmentMarketValue |  |  |
Swiss franchise realized gains | 2.5 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |  | 3.6 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |  | 0.1 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains |
Swiss franchise realized losses | 0.5 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |  | 1.4 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |  | 0.2 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses |
Capitalized software for internal use [Abstract] |  |  |  |  |  |
Capitalized Software, Useful Life, Minimum | 3 years |  |  |  |  |
Capitalized Software, Useful Life, Maximum | 10 years |  |  |  |  |
Net capitalized software | 5.3 us-gaap_CapitalizedComputerSoftwareNet |  | 4.6 us-gaap_CapitalizedComputerSoftwareNet |  |  |
Amortization expense related to the capitalized software costs | 2.2 us-gaap_CapitalizedComputerSoftwareAmortization |  | 5.6 us-gaap_CapitalizedComputerSoftwareAmortization |  | 7.3 us-gaap_CapitalizedComputerSoftwareAmortization |
Property and equipment [Abstract] |  |  |  |  |  |
Property and equipment, gross | 633.5 us-gaap_PropertyPlantAndEquipmentGross |  | 706.2 us-gaap_PropertyPlantAndEquipmentGross |  |  |
Shareholders' Equity [Abstract] |  |  |  |  |  |
Shares authorized to be repurchased (in shares) | 8.0 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |
Remaining number of shares authorized to be repurchased (in shares) | 6.0 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |
Shares repurchased (in shares) | 2.0 us-gaap_TreasuryStockSharesAcquired |  | 0 us-gaap_TreasuryStockSharesAcquired |  | 3.6 us-gaap_TreasuryStockSharesAcquired |
Total cost of shares repurchased | 143.5 us-gaap_TreasuryStockValueAcquiredParValueMethod |  | 0 us-gaap_TreasuryStockValueAcquiredParValueMethod |  | 138.2 us-gaap_TreasuryStockValueAcquiredParValueMethod |
Dividends declared (in dollars per share) | $ 0.98 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.92 us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.86 us-gaap_CommonStockDividendsPerShareDeclared |
Total dividend paid | 77.3 us-gaap_PaymentsOfDividendsCommonStock |  | 72.0 us-gaap_PaymentsOfDividendsCommonStock |  | 67.8 us-gaap_PaymentsOfDividendsCommonStock |
Payroll Tax Credit [Abstract] |  |  |  |  |  |
Multiplier for payroll tax credits | 2.5 man_MultiplierForPayrollTaxCredits |  |  |  |  |
Percentage of eligible wages for tax credit (in hundredths) | 6.00%man_CICEPayrollTaxCredit |  | 4.00%man_CICEPayrollTaxCredit |  |  |
Payment period of the CICE payroll tax credit | 3 years |  |  |  |  |
Net proceeds from sale of tax credits |  |  | 104.0 us-gaap_ProceedsFromSaleOfOtherReceivables |  |  |
Land [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property and equipment, gross | 5.7 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |  | 6.2 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandMember |  |  |
Buildings [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property and equipment, gross | 19.2 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  | 20.8 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingMember |  |  |
Furniture, Fixtures and Autos [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property and equipment, gross | 178.2 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = man_FurnitureFixturesAndAutosMember |  | 194.1 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = man_FurnitureFixturesAndAutosMember |  |  |
Computer Equipment [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property and equipment, gross | 153.0 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  | 168.1 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember |  |  |
Leasehold Improvements [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property and equipment, gross | 277.4 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  | 317.0 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember |  |  |
Trade Names [Member] |  |  |  |  |  |
Indefinite-lived [Abstract] |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross | 54.0 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [4] | 54.0 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [4] |  |
Indefinite-Lived intangible assets, Accumulated Amortization | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [4] | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [4] |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 54.0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [4] | 54.0 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember | [4] |  |
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 | 97.3 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  | 97.7 man_IndefiniteLivedIntangibleAssetsExcludingGoodwillGross / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  |  |
Indefinite-Lived intangible assets, Accumulated Amortization | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  | 0 man_AccumulatedAmortizationOnInfiniteIntangibleAssets / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 97.3 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  | 97.7 us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = man_ReacquiredFranchiseRightsMember |  |  |
Technology [Member] |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 19.6 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 | 19.6 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 |  |  |
Weighted-average useful lives (in years) | 5 years |  |  |  |  |
Franchise Agreements [Member] |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 18.0 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 | 18.0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  | 17.9 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  |  |
Finite-Lived Intangible Assets, Net | 0 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  | 0.1 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_FranchiseRightsMember |  |  |
Weighted-average useful lives (in years) | 10 years |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 359.9 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 351.5 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 225.6 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 196.4 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Finite-Lived Intangible Assets, Net | 134.3 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  | 155.1 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember |  |  |
Weighted-average useful lives (in years) | 14 years |  |  |  |  |
Other [Member] |  |  |  |  |  |
Finite-lived [Abstract] |  |  |  |  |  |
Finite-Lived Intangible Assets, Gross | 14.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 16.2 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 13.0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 14.0 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |  |
Finite-Lived Intangible Assets, Net | 1.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  | 2.2 us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_OtherIntangibleAssetsMember |  |  |
Weighted-average useful lives (in years) | 3 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Nature of operations [Abstract] |  |  |  |  |  |
Discount rate for goodwill impairment test (in hundredths) | 11.70%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Minimum [Member] | Furniture, Fixtures and Autos [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |  |  |  |
Minimum [Member] | Computer Equipment [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Nature of operations [Abstract] |  |  |  |  |  |
Discount rate for goodwill impairment test (in hundredths) | 17.80%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Maximum [Member] | Buildings [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |  |  |
Maximum [Member] | Furniture, Fixtures and Autos [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |  |  |  |
Maximum [Member] | Computer Equipment [Member] |  |  |  |  |  |
Property and equipment [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Useful Life | 15 years |  |  |  |  |
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Carrying Amount [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Euro-denominated notes | 423.4 us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  | 480.9 us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |  |  |
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member] |  |  |  |  |  |
Fair Value Measurements [Abstract] |  |  |  |  |  |
Euro-denominated notes | 471.6 us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  | 520.1 us-gaap_NotesPayableFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |
Recurring Basis [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 0.1 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 0.3 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Deferred compensation plan assets | 81.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 71.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Total assets measured at fair value | 81.5 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 71.9 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Recurring Basis [Member] | Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 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 |  |  |
Deferred compensation plan assets | 81.4 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 71.6 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Total assets measured at fair value | 81.4 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 71.6 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Recurring Basis [Member] | Fair Value Measurements Using Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 0.1 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 0.3 us-gaap_ForeignCurrencyContractAssetFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Deferred compensation plan assets | 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 |  |  |
Total assets measured at fair value | 0.1 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  | 0.3 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |
Recurring Basis [Member] | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) [Member] |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |
Foreign currency forward contracts | 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 |  |  |
Deferred compensation plan assets | 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 |  |  |
Total assets measured at fair value | 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 |  |  |
Allowance for Doubtful Accounts [Member] |  |  |  |  |  |
Allowance for doubtful accounts [Abstract] |  |  |  |  |  |
Bad debt expense | 18.9 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 24.1 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | 29.2 us-gaap_ProvisionForDoubtfulAccounts / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
Write-offs of accounts receivable | $ 15.8 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | $ 26.4 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |  | $ 23.2 us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AllowanceForDoubtfulAccountsMember |
[1] | Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2014 and 2013.
[2] | Balances were net of accumulated impairment loss of $513.4 as of January 1, 2013, December 31, 2013 and December 31, 2014.
[3] | Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[4] | Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2014 and 2013.

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