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Components of Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current      
Federal $ (81.5) $ 87.1 $ 0.4
Other state and local 3.2 (0.7) 0.0
Foreign 46.5 62.4 27.5
Total current (31.8) 148.8 27.9
Deferred      
Federal (5.1) (122.3) 31.2
Other state and local (6.7) (17.0) 0.0
Foreign (13.5) (7.0) (0.8)
Total deferred (25.3) (146.3) 30.4
Total income tax expense (benefit) $ (57.1) $ 2.5 $ 58.3