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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Retained earnings beginning balance     $ 539.5  
Net (loss) income $ (140.0) $ 4.8 (352.4) $ 19.7
Distribution of MFS     51.2  
Retained earnings ending balance 238.3   238.3  
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Retained earnings beginning balance     539.5 486.9
Net (loss) income     (352.4) 19.7
Retained earnings ending balance $ 238.3 $ 506.6 $ 238.3 $ 506.6