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Income Taxes - Tax Provision Summary (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current provision        
Federal $ 107.1 $ 73.5 $ 73.5  
State 7.2 3.1 4.5  
Foreign 32.4 31.3 39.9  
Total current 146.7 107.9 117.9  
Deferred provision        
Federal (12.3) (67.7) (21.4)  
State (3.7) 7.5 1.6  
Foreign (5.3) 0.0 (11.3)  
Total deferred (21.3) (60.2) (31.1)  
Effective income tax provision $ 125.4 $ 47.7 $ 86.8 $ 125.4