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Stockholders' Equity - Stockholders equity roll forward (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Schedule of Capitalization, Equity [Line Items]    
Retained earnings beginning balance $ 539.5  
Distribution of MFS (204.0) $ (8.4)
Distribution of MFS 50.8  
Retained earnings beginning balance 386.3  
Retained Earnings    
Schedule of Capitalization, Equity [Line Items]    
Retained earnings beginning balance 539.5 486.9
Distribution of MFS (204.0) (8.4)
Retained earnings beginning balance $ 386.3 $ 478.5