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Income Taxes (Taxes by Jurisdiction) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current Income Tax Expense (Benefit) $ 0.5 $ 1.6 $ 1.0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 0.7 1.5 (14.6)
Provision (benefit) for income taxes (0.2) 0.1 15.6
Domestic Tax Jurisdiction [Member]      
Current Income Tax Expense (Benefit) 0.0 0.0 0.0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 0.6 0.7 (14.9)
State and Local Jurisdiction [Member]      
Current Income Tax Expense (Benefit) 0.5 1.6 1.0
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability 0.1 0.8 0.3
Foreign Tax Jurisdiction [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