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Goodwill - Goodwill by Reporting Unit (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 1,257.4 | $ 1,075.2 | $ 1,090.9
United States |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 532.4 | 505.9 |
Germany |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 127.1 | 12.1 |
United Kingdom |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 101.1 | 85.9 |
Netherlands |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 98.7 | 85.9 |
France |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 69.0 | 76.9 |
Right Management |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 62.1 | 62.1 |
Other reporting units |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 267.0 | $ 246.4 |

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