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Income Taxes (Components of Income Tax Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current tax expense (benefit):      
U.S. federal $ 4.3 $ 0.8 $ (4.7)
State 5.4 3.7 (0.3)
Foreign 4.8 4.5 3.2
Total current tax expense (benefit) 14.5 9.0 (1.8)
Deferred tax expense (benefit):      
U.S. federal 8.6 11.0 3.6
State (6.3) (1.7) 8.5
Total deferred tax expense 2.3 9.3 12.1
Total $ 16.8 $ 18.3 $ 10.3