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Income Taxes - Components of Provision (Benefit) for Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current tax expense (benefit):      
Federal $ 17.8 $ 12.0 $ 7.0
Foreign (0.1) 0.8 0.6
State and local 5.7 2.9 2.0
Total current tax expense 23.4 15.7 9.6
Deferred tax expense (benefit):      
Federal 0.6 (15.7) 8.4
Foreign (6.5) 0.8 (0.7)
State and local 0.4 (0.3) 0.1
Total deferred tax (benefit) expense (5.5) (15.2) 7.8
Total income tax expense $ 17.9 $ 0.5 $ 17.4