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Net Earnings Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net Earnings Per Share - Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings available to common shareholders | $ 117.2 us-gaap_ProfitLoss | $ 130.5 us-gaap_ProfitLoss | $ 109.8 us-gaap_ProfitLoss | $ 70.1 us-gaap_ProfitLoss | $ 101.2 us-gaap_ProfitLoss |  | $ 94.7 us-gaap_ProfitLoss |  | $ 68.2 us-gaap_ProfitLoss |  | $ 23.9 us-gaap_ProfitLoss |  | $ 427.6 us-gaap_ProfitLoss | $ 288.0 us-gaap_ProfitLoss |  | $ 197.6 us-gaap_ProfitLoss
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 79,500,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 79,500,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net earnings per share - basic (in dollars per share) | $ 1.49 us-gaap_EarningsPerShareBasic | $ 1.64 us-gaap_EarningsPerShareBasic | $ 1.37 us-gaap_EarningsPerShareBasic | $ 0.88 us-gaap_EarningsPerShareBasic | $ 1.28 us-gaap_EarningsPerShareBasic |  | $ 1.21 us-gaap_EarningsPerShareBasic |  | $ 0.88 us-gaap_EarningsPerShareBasic |  | $ 0.31 us-gaap_EarningsPerShareBasic |  | $ 5.38 us-gaap_EarningsPerShareBasic | $ 3.69 us-gaap_EarningsPerShareBasic |  | $ 2.49 us-gaap_EarningsPerShareBasic
Net Earnings Per Share - Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings available to common shareholders | $ 117.2 us-gaap_ProfitLoss | $ 130.5 us-gaap_ProfitLoss | $ 109.8 us-gaap_ProfitLoss | $ 70.1 us-gaap_ProfitLoss | $ 101.2 us-gaap_ProfitLoss |  | $ 94.7 us-gaap_ProfitLoss |  | $ 68.2 us-gaap_ProfitLoss |  | $ 23.9 us-gaap_ProfitLoss |  | $ 427.6 us-gaap_ProfitLoss | $ 288.0 us-gaap_ProfitLoss |  | $ 197.6 us-gaap_ProfitLoss
Weighted-average common shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 79,500,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,000,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 79,500,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities - stock options (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 man_IncrementalCommonSharesAttributableToStockOptions | 800,000 man_IncrementalCommonSharesAttributableToStockOptions |  | 300,000 man_IncrementalCommonSharesAttributableToStockOptions
Effect of other share-based awards (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 600,000 man_DilutiveSecuritiesEffectOnBasicEarningsPerShareOtherAwards | 800,000 man_DilutiveSecuritiesEffectOnBasicEarningsPerShareOtherAwards |  | 300,000 man_DilutiveSecuritiesEffectOnBasicEarningsPerShareOtherAwards
Weighted-average common shares outstanding - diluted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 80,700,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,600,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  | 80,100,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net earnings per share - diluted (in dollars per share) | $ 1.47 us-gaap_EarningsPerShareDiluted | $ 1.61 us-gaap_EarningsPerShareDiluted | $ 1.35 us-gaap_EarningsPerShareDiluted | $ 0.86 us-gaap_EarningsPerShareDiluted | $ 1.25 us-gaap_EarningsPerShareDiluted | [1] | $ 1.18 us-gaap_EarningsPerShareDiluted | [1] | $ 0.87 us-gaap_EarningsPerShareDiluted | [1] | $ 0.31 us-gaap_EarningsPerShareDiluted | [1] | $ 5.30 us-gaap_EarningsPerShareDiluted | $ 3.62 us-gaap_EarningsPerShareDiluted | [1] | $ 2.47 us-gaap_EarningsPerShareDiluted
Share-Based Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from the calculation of Net Earnings Per Share (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 692,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember | 995,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember |  | 4,257,000 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember
Weighted-average remaining life |  |  |  |  |  |  |  |  |  |  |  |  | 4 years 1 month 6 days | 5 years 2 months 12 days |  | 4 years 9 months 18 days
Share-Based Awards [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 76 man_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 67 man_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  | $ 40 man_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Share-Based Awards [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price range (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 93 man_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 93 man_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | $ 93 man_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareExercisePrice / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_StockCompensationPlanMember / us-gaap_RangeAxis = us-gaap_MaximumMember
[1] | Included in the results are restructuring costs per diluted share of ($0.32), ($0.18), ($0.08) and ($0.24) for the first, second, third and fourth quarters, respectively.

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