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Income Taxes (Taxes by Jurisdiction) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Current Income Tax Expense (Benefit) $ 1.0 $ 0.4 $ 0.5
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability (14.6) 39.5 1.9
Provision (benefit) for income taxes 15.6 (39.1) (1.4)
Domestic Tax Authority [Member]      
Current Income Tax Expense (Benefit) 0.0 0.0 0.0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability (14.9) 40.7 0.0
State and Local Jurisdiction [Member]      
Current Income Tax Expense (Benefit) 1.0 0.4 0.5
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 0.3 (1.2) 1.9
Foreign Tax Authority [Member]      
Current Income Tax Expense (Benefit) 0.0 0.0 0.0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability $ 0.0 $ 0.0 $ 0.0