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Income Taxes - Tax Provision Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current provision      
Federal $ (14.6) $ 73.5 $ 73.5
State 1.1 3.1 4.6
Foreign 57.1 28.3 39.3
Total current 43.6 104.9 117.4
Deferred provision      
Federal 11.4 (67.7) (21.4)
State (4.5) 7.6 1.6
Foreign (0.9) (1.0) (11.3)
Total deferred 6.0 (61.1) (31.1)
Effective income tax provision $ 49.6 $ 43.8 $ 86.3