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Income Taxes (Components of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current tax (benefit) expense:      
U.S. federal $ (4.7) $ 0.3 $ 1.4
State (0.3) 3.8 2.1
Foreign 3.2 4.3 4.5
Total current tax (benefit) expense (1.8) 8.4 8.0
Deferred tax expense (benefit):      
U.S. federal 3.6 (39.3) (3.1)
State 8.5 (23.8) (0.3)
Total deferred tax expense (benefit) 12.1 (63.1) (3.4)
Income tax expense (benefit) $ 10.3 $ (54.7) $ 4.6