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Income Taxes - Tax Provision Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current provision      
Federal $ 73.5 $ 107.1 $ 50.7
State 4.5 7.2 4.5
Foreign 39.9 32.4 36.9
Total current 117.9 146.7 92.1
Deferred provision      
Federal (21.4) (12.3) (25.2)
State 1.6 (3.7) (1.2)
Foreign (11.3) (5.3) (0.8)
Total deferred (31.1) (21.3) (27.2)
Effective income tax provision $ 86.8 $ 125.4 $ 64.9