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Goodwill, Reporting Unit (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 1,075.2 us-gaap_Goodwill | [1],[2] | $ 1,090.9 us-gaap_Goodwill | [1],[2] | $ 1,041.3 us-gaap_Goodwill | [1]
United States [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 505.9 us-gaap_Goodwill / man_ReportingUnitAxis = country_US |  | 504.0 us-gaap_Goodwill / man_ReportingUnitAxis = country_US |  |  |
France [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 76.9 us-gaap_Goodwill / man_ReportingUnitAxis = country_FR |  | 87.3 us-gaap_Goodwill / man_ReportingUnitAxis = country_FR |  |  |
United Kingdom [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 85.9 us-gaap_Goodwill / man_ReportingUnitAxis = country_GB |  | 84.6 us-gaap_Goodwill / man_ReportingUnitAxis = country_GB |  |  |
Netherlands [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 85.9 us-gaap_Goodwill / man_ReportingUnitAxis = man_NetherlandsVitaeMember |  | 84.1 us-gaap_Goodwill / man_ReportingUnitAxis = man_NetherlandsVitaeMember |  |  |
Right Management [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | 62.1 us-gaap_Goodwill / man_ReportingUnitAxis = man_RightManagementMember |  | 62.1 us-gaap_Goodwill / man_ReportingUnitAxis = man_RightManagementMember |  |  |
Other reporting units [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 258.5 us-gaap_Goodwill / man_ReportingUnitAxis = us-gaap_AllOtherSegmentsMember |  | $ 268.8 us-gaap_Goodwill / man_ReportingUnitAxis = us-gaap_AllOtherSegmentsMember |  |  |
[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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Details
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