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Goodwill and Other Intangible Assets, Goodwill by Reporting Unit (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Goodwill [Line Items] |  |  |  |
Goodwill | $ 1,092.6 | [1] | $ 1,090.9 | [1]
United States [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 505.9 |  | 504.0 |
Netherlands [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 89.7 |  | 84.1 |
United Kingdom [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 87.2 |  | 84.6 |
France [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 80.2 |  | 87.3 |
Right Management [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 62.1 |  | 62.1 |
Other reporting units [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 267.5 |  | $ 268.8 |
[1] | Balances were net of accumulated impairment loss of $513.4 as of both September 30, 2014 and December 31, 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
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration