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Acquisitions (Details) In Millions, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2012 Damilo Group [Member] USD ($) | Dec. 31, 2012 Damilo Group [Member] EUR (€) | Dec. 31, 2014 Damilo Group [Member] USD ($) | Dec. 31, 2014 Damilo Group [Member] EUR (€) | Dec. 31, 2013 Damilo Group [Member] USD ($) | Dec. 31, 2013 Damilo Group [Member] EUR (€)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total cash consideration paid for acquisitions, net of cash acquired or Total purchase price | $ 32.0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  | $ 46.3 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  | $ 49.0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  | $ 28.0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | € 21.2 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember |  |  |  |
Assumed liabilities |  |  |  |  |  |  | 44.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | 33.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember |  |  |  |
Goodwill | 1,075.2 us-gaap_Goodwill | [1],[2] | 1,090.9 us-gaap_Goodwill | [1],[2] | 1,041.3 us-gaap_Goodwill | [1] | 40.6 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | 30.8 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember |  |  |  |
Goodwill acquired during the period | 39.4 us-gaap_GoodwillAcquiredDuringPeriod |  | 52.2 us-gaap_GoodwillAcquiredDuringPeriod |  |  |  |  |  |  |  |  |
Intangible assets | 286.8 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 309.1 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  |  |  | 5.1 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | 4.2 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | 6.8 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | 5.0 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember
Intangible assets acquired during the period | 10.1 us-gaap_FinitelivedIntangibleAssetsAcquired1 |  | 10.1 us-gaap_FinitelivedIntangibleAssetsAcquired1 |  |  |  |  |  |  |  |  |
Assets acquired, net of goodwill, related intangible assets and cash |  |  |  |  |  |  | $ 23.6 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember | € 17.9 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = man_DamiloGroupMember |  |  |  |
[1] | Balances were net of accumulated impairment loss of $513.4 as of January 1, 2013, December 31, 2013 and December 31, 2014.
[2] | Balances were net of accumulated impairment loss of $513.4 as of both December 31, 2014 and 2013.

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