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Goodwill and Other Intangible Assets, Goodwill by Reporting Unit (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill $ 1,083.6 $ 1,075.2
United States [Member]    
Goodwill [Line Items]    
Goodwill 505.9 505.9
Netherlands [Member]    
Goodwill [Line Items]    
Goodwill 97.3 85.9
United Kingdom [Member]    
Goodwill [Line Items]    
Goodwill 86.6 85.9
France [Member]    
Goodwill [Line Items]    
Goodwill 70.8 76.9
Right Management [Member]    
Goodwill [Line Items]    
Goodwill 62.1 62.1
Other reporting units [Member]    
Goodwill [Line Items]    
Goodwill $ 260.9 $ 258.5