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Goodwill and Other Intangible Assets - Goodwill by Reporting Unit (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill | $ 1,272.3 | $ 1,257.4
United States |  |
Goodwill [Line Items] |  |
Goodwill | 532.4 | 532.4
Germany |  |
Goodwill [Line Items] |  |
Goodwill | 129.2 | 127.1
Netherlands |  |
Goodwill [Line Items] |  |
Goodwill | 114.5 | 98.7
United Kingdom |  |
Goodwill [Line Items] |  |
Goodwill | 91.9 | 101.1
France |  |
Goodwill [Line Items] |  |
Goodwill | 70.6 | 69.0
Right Management |  |
Goodwill [Line Items] |  |
Goodwill | 62.1 | 62.1
Other reporting units |  |
Goodwill [Line Items] |  |
Goodwill | $ 271.6 | $ 267.0

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