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Stockholders' Equity (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 13, 2017
Stockholders' Equity Note, Stock Split           1.333  
Stock Repurchase Program, Authorized Amount       $ 300.0     $ 300.0
Stock Repurchase Program, Period in Force       3 years      
Treasury Stock, Shares, Acquired 1,650,000 1,850,000          
Payments for Repurchase of Common Stock $ 65.2 $ 68.3   $ 133.5 $ 0.7 $ 0.3  
Preferred Stock, Shares Authorized       100,000,000 100,000,000    
Preferred Stock, Shares Issued       0 0    
Preferred Stock, Shares Outstanding       0 0    
Redeemable noncontrolling interest change     $ 59.5        
Redeemable Noncontrolling Interest, Equity, Fair Value       $ 0.0 $ 0.0