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Goodwill and Other Intangible Assets, Goodwill by Reporting Unit (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Goodwill [Line Items] |  |  |  |
Goodwill | $ 1,056.8 us-gaap_Goodwill | [1] | $ 1,075.2 us-gaap_Goodwill | [1]
United States [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 505.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US |  | 505.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_US |
Netherlands [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 93.7 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NetherlandsVitaeMember |  | 85.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_NetherlandsVitaeMember |
United Kingdom [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 81.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_GB |  | 85.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_GB |
France [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 68.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_FR |  | 76.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = country_FR |
Right Management [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 62.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |  | 62.1 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = man_RightManagementMember |
Other reporting units [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 245.3 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 258.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
[1] | Balances were net of accumulated impairment loss of $513.4 as of both March 31, 2015 and December 31, 2014.

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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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