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Share-Based Compensation Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended 1 Months Ended 8 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 14, 2013
Oct. 29, 2014
Feb. 28, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense (benefit) $ 40.6us-gaap_ShareBasedCompensation $ 31.5us-gaap_ShareBasedCompensation $ 30.0us-gaap_ShareBasedCompensation        
Income tax benefit recognized related to share-based compensation 12.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 21.2us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 2.4us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense        
Consideration received from share-based awards 25.5us-gaap_SaleOfStockConsiderationReceivedOnTransaction 101.0us-gaap_SaleOfStockConsiderationReceivedOnTransaction 6.0us-gaap_SaleOfStockConsiderationReceivedOnTransaction        
Excess income tax benefit recognized related to share-based compensation awards 4.6us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation 8.4us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation (2.1)us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation        
Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period 4 years            
Expiration period 10 years            
Share-based compensation expense (benefit) 6.8us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 7.5us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 9.4us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Fair value of options vested 11.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 9.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 11.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Total unrecognized compensation cost, net of estimated forfeitures 3.9us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Total unrecognized compensation cost, weighted-average period for recognition 1 year 9 months 18 days            
Risk-free interest rate term 5 years            
Weighted average of daily historical volatility of Company's stock price, weight (in hundredths) 75.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Implied volatility based on exchange traded options for Company's common stock, weight (in hundredths) 25.00%man_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsImpliedVolatilityStockOptionsWeight
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Weighted-average grant-date fair value of options granted (in dollars per share) $ 25.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 17.99us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 15.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Stock Options, Shares [Roll forward]              
Outstanding, beginning of period (in shares) 2,783,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 5,344,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 5,265,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Granted (in shares) 204,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 221,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 302,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Exercised (in shares) (473,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 (2,576,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 (116,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Expired or cancelled (in shares) (30,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 (206,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 (107,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Outstanding, end of period (in shares) 2,484,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,783,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 5,344,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Vested or expected to vest, end of period (in shares) 2,476,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,769,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 5,326,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Exercisable, end of period (in shares) 1,957,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 2,153,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 4,210,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Stock Options, Weighted Average Exercise Price [Abstract]              
Weighted average exercise price, Outstanding, beginning of period (in dollars per share) $ 57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Weighted average exercise price, Granted (in dollars per share) $ 77us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 53us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 45us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Weighted average exercise price, Exercised (in dollars per share) $ 53us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 43us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 34us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Weighted average exercise price, Expired or cancelled (in dollars per share) $ 43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Weighted average exercise price, Outstanding, end of period (in dollars per share) $ 59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Weighted average exercise price, Vested or expected to vest, end of period (in dollars per share) $ 59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 50us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Weighted average exercise price, Exercisable, end of period (in dollars per share) $ 59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 58us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 $ 51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Stock Options, Additional [Abstract]              
Weighted average remaining contractual term, Outstanding, end of period 4 years 8 months 12 days 5 years 1 month 6 days 5 years        
Weighted average remaining contractual term, Vested or expected to vest, end of period (in years) 4 years 6 months 4 years 9 months 18 days 4 years 10 months 24 days        
Weighted average remaining contractual term, Exercisable, end of period (in years) 3 years 8 months 12 days 4 years 2 months 12 days 4 years 3 months 18 days        
Aggregate intrinsic value, Exercised 13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Aggregate intrinsic value, Outstanding, end of period 28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Aggregate intrinsic value, Exercisable, end of period 23us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 60us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 11us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Assumptions used to estimate fair value [Abstract]              
Average risk-free interest rate (in hundredths) 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Expected dividend yield (in hundredths) 1.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 1.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Expected volatility (in hundredths) 37.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 42.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		 44.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		        
Expected term 5 years 10 months 24 days 5 years 10 months 24 days 5 years 10 months 24 days        
Options outstanding and exercisable [Abstract]              
Options outstanding, shares (in shares) 2,484,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Options outstanding, weighted-average remaining contractual life 4 years 8 months 12 days            
Options outstanding, weighted-average exercise price (in dollars per share) $ 59us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Options exercisable, shares (in shares) 1,957,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Options exercisable, weighted-average exercise price (in dollars per share) $ 59us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		            
Stock Options [Member] | Exercise Price $27 - $34 [Member]              
Options outstanding and exercisable [Abstract]              
Exercise price range, lower range limit (in dollars per share) $ 27us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeOneMember		            
Exercise price range, upper range limit (in dollars per share) $ 34us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeOneMember		            
Options outstanding, shares (in shares) 150,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeOneMember		            
Options outstanding, weighted-average remaining contractual life 3 years 9 months 18 days            
Options outstanding, weighted-average exercise price (in dollars per share) $ 31us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeOneMember		            
Options exercisable, shares (in shares) 150,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeOneMember		            
Options exercisable, weighted-average exercise price (in dollars per share) $ 31us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeOneMember		            
Stock Options [Member] | Exercise Price $35 - $44 [Member]              
Options outstanding and exercisable [Abstract]              
Exercise price range, lower range limit (in dollars per share) $ 35us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeTwoMember		            
Exercise price range, upper range limit (in dollars per share) $ 44us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeTwoMember		            
Options outstanding, shares (in shares) 212,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeTwoMember		            
Options outstanding, weighted-average remaining contractual life 5 years 4 months 24 days            
Options outstanding, weighted-average exercise price (in dollars per share) $ 45us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeTwoMember		            
Options exercisable, shares (in shares) 93,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeTwoMember		            
Options exercisable, weighted-average exercise price (in dollars per share) $ 45us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeTwoMember		            
Stock Options [Member] | Exercise Price $45 - $55 [Member]              
Options outstanding and exercisable [Abstract]              
Exercise price range, lower range limit (in dollars per share) $ 45us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeThreeMember		            
Exercise price range, upper range limit (in dollars per share) $ 55us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeThreeMember		            
Options outstanding, shares (in shares) 818,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeThreeMember		            
Options outstanding, weighted-average remaining contractual life 5 years 2 months 12 days            
Options outstanding, weighted-average exercise price (in dollars per share) $ 53us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeThreeMember		            
Options exercisable, shares (in shares) 658,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeThreeMember		            
Options exercisable, weighted-average exercise price (in dollars per share) $ 53us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeThreeMember		            
Stock Options [Member] | Exercise Price $56 - $93 [Member]              
Options outstanding and exercisable [Abstract]              
Exercise price range, lower range limit (in dollars per share) $ 56us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeFourMember		            
Exercise price range, upper range limit (in dollars per share) $ 93us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeFourMember		            
Options outstanding, shares (in shares) 1,304,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeFourMember		            
Options outstanding, weighted-average remaining contractual life 4 years            
Options outstanding, weighted-average exercise price (in dollars per share) $ 69us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeFourMember		            
Options exercisable, shares (in shares) 1,056,000us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeFourMember		            
Options exercisable, weighted-average exercise price (in dollars per share) $ 67us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= man_RangeFourMember		            
Stock Options [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Purchase price (in hundredths) 100.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		            
Deferred Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense (benefit) 0.7us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember		 0.9us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember		 0.8us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember		        
Deferred Stock [Member] | In Lieu of Annual Cash Retainer [Member]              
Deferred Stock [Abstract]              
Stock units granted at period end (in shares) 33,985man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_InLieuOfAnnualCashRetainerMember		 31,733man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_InLieuOfAnnualCashRetainerMember		 28,400man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_InLieuOfAnnualCashRetainerMember		        
Deferred Stock [Member] | Additional Compensation for Board Service [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based payment award vesting period 1 year            
Expiration period 3 years            
Deferred Stock [Abstract]              
Stock units granted at period end (in shares) 5,199man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_AdditionalCompensationForBoardServiceMember		 14,844man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_AdditionalCompensationForBoardServiceMember		 14,685man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= man_DeferredStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_AdditionalCompensationForBoardServiceMember		        
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Maximum term for restrictions to lapse 6 years            
Share-based compensation expense (benefit) 12.9us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 9.8us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 10.0us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Total unrecognized compensation cost, net of estimated forfeitures 10.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		            
Total unrecognized compensation cost, weighted-average period for recognition 2 years            
Equity Other Than Options, Shares [Abstract]              
Unvested, beginning of period (in shares) 627,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 589,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 409,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Granted (in shares) 169,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 192,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 309,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Vested (in shares) (283,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 (90,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 (124,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Forfeited (in shares) (50,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 (64,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 (5,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Unvested, end of period (in shares) 463,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 627,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 589,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 409,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Equity Other Than Options, Weighted Average Price Per Share [Abstract]              
Weighted average price per share, Unvested, beginning of period (in dollars per share) $ 54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Weighted average price per share, Granted (in dollars per share) $ 77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 44us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Weighted average price per share, Vested (in dollars per share) $ 63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Weighted average price per share, Forfeited (in dollars per share) $ 53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		        
Weighted average price per share, Unvested, end of period (in dollars per share) $ 57us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		 $ 59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		      
Equity Other Than Options, Additional [Abstract]              
Weighted average remaining contractual term, Unvested, end of period (in years) 1 year 2 months 12 days 1 year 3 months 18 days 1 year 8 months 12 days 1 year 9 months 18 days      
Aggregate intrinsic value, Unvested, end of period 32man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember		            
Restricted Stock [Member] | Additional Compensation for Board Service [Member]              
Deferred Stock [Abstract]              
Stock units granted at period end (in shares) 10,248man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_AdditionalCompensationForBoardServiceMember		 14,844man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_AdditionalCompensationForBoardServiceMember		 20,559man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsByTypeOfDeferredCompensationAxis
= man_AdditionalCompensationForBoardServiceMember		        
Performance Share Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense (benefit) 20.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 13.1us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 9.6us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Equity Other Than Options, Shares [Abstract]              
Granted (in shares)         7,612us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 3,046us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		  
Performance Share Units [Member] | Minimum [Member]              
Performance Share Units [Abstract]              
Performance period range 1 year            
Performance Share Units [Member] | Maximum [Member]              
Performance Share Units [Abstract]              
Performance period range 3 years            
2012 [Member] | Performance Share Units [Member]              
Performance Share Units Detail [Abstract]              
Grant Date     February 15, 2012        
Performance period     2012        
Vesting Date(s)     50% on December 31, 2013 and 2014        
Payout Levels (in units):              
Threshold Award     84,480man_ThresholdAward
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Target Award     168,960man_TargetAward
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Outstanding Award     337,920man_OutstandingAward
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Units Forfeited in 2014 (at Target Award level)     0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod1
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Shares Issued in 2014     72,843man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Shares Subject to Holding Period as of December 31, 2014     0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSubjectToHolding
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
Award payout percentage of performance target (in hundredths)     96.00%man_AwardPayoutPercentageOfPerformanceTarget
/ us-gaap_AwardDateAxis
= man_Granted2012Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		        
July 2012 and February 2013 [Member] | Performance Share Units [Member]              
Performance Share Units Detail [Abstract]              
Grant Date             July 1, 2012 and February 14, 2013
Vesting Date(s)             50% on July 1, 2015 and 2016
Payout Levels (in units):              
Threshold Award             66,949man_ThresholdAward
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Target Award             133,898man_TargetAward
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Outstanding Award             267,796man_OutstandingAward
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Units Forfeited in 2014 (at Target Award level)             0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod1
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Shares Issued in 2014             0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Shares Subject to Holding Period as of December 31, 2014             0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSubjectToHolding
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Award payout percentage of performance target (in hundredths)             0.00%man_AwardPayoutPercentageOfPerformanceTarget
/ us-gaap_AwardDateAxis
= man_GrantedJuly2012AndFebruary2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
July 2012 and February 2013 [Member] | Performance Share Units [Member] | Minimum [Member]              
Performance Share Units Detail [Abstract]              
Performance period             2012
July 2012 and February 2013 [Member] | Performance Share Units [Member] | Maximum [Member]              
Performance Share Units Detail [Abstract]              
Performance period             2014
2013 [Member] | Performance Share Units [Member]              
Performance Share Units Detail [Abstract]              
Grant Date   February 14, 2013 [1]          
Performance period   2013 [1]          
Vesting Date(s)   50% on December 31, 2014 and 2015 [1]          
Payout Levels (in units):              
Threshold Award   76,120man_ThresholdAward
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
Target Award   152,240man_TargetAward
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
Outstanding Award   304,480man_OutstandingAward
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
Units Forfeited in 2014 (at Target Award level)   0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod1
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
Shares Issued in 2014   101,239man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
Shares Subject to Holding Period as of December 31, 2014   108,853man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSubjectToHolding
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
Award payout percentage of performance target (in hundredths)   140.00%man_AwardPayoutPercentageOfPerformanceTarget
/ us-gaap_AwardDateAxis
= man_Granted2013Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [1]          
2014 [Member] | Performance Share Units [Member]              
Performance Share Units Detail [Abstract]              
Grant Date February 11, 2014 and May 1, 2014 [2]            
Vesting Date(s) 100% on December 31, 2016 [2]            
Payout Levels (in units):              
Threshold Award 94,608man_ThresholdAward
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
Target Award 189,215man_TargetAward
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
Outstanding Award 378,430man_OutstandingAward
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
Units Forfeited in 2014 (at Target Award level) 0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod1
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
Shares Issued in 2014 0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsIssuedInPeriod
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
Shares Subject to Holding Period as of December 31, 2014 0man_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsSubjectToHolding
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
Award payout percentage of performance target (in hundredths) 200.00%man_AwardPayoutPercentageOfPerformanceTarget
/ us-gaap_AwardDateAxis
= man_Granted2014Member
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 [2]            
2014 [Member] | Performance Share Units [Member] | Minimum [Member]              
Performance Share Units Detail [Abstract]              
Performance period 2014 [2]            
2014 [Member] | Performance Share Units [Member] | Maximum [Member]              
Performance Share Units Detail [Abstract]              
Performance period 2016 [2]            
U. K. Savings Related Share Option Scheme [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense (benefit) $ 0.1us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= man_UKSavingsRelatedShareOptionSchemeMember		 $ 0.2us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= man_UKSavingsRelatedShareOptionSchemeMember		 $ 0.2us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= man_UKSavingsRelatedShareOptionSchemeMember		        
Other Stock Plans [Abstract]              
Requisite service period (in years) 1 year            
Purchase price, minimum (in hundredths) 85.00%man_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsPurchasePricePercentageOfFairMarketValueMinimum
/ us-gaap_PlanNameAxis
= man_UKSavingsRelatedShareOptionSchemeMember		            
Possible vesting period term either three, five or seven years            
Payroll deduction period to accumulate funds used for share-based payment award (in months) 60 months            
[1] Included in these figures are 7,612 of performance share units that were granted on February 14, 2013 with a separate performance period, performance criteria and vesting date. The performance period is 2013 through 2015, with a vesting date of July 1, 2016. The award's current performance level is at Target.
[2] Included in these figures are 3,046 of performance share units that were granted on October 29, 2014 with a separate performance period, performance criteria and vesting date. The performance period is June 1, 2015 through December 31, 2016, with a vesting date of October 29, 2017. The award's current performance level is at Target.