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Income Taxes - Schedule of Income Tax Expense (Benefit) on Income from Continuing Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ 0.0 $ (18.0) $ 0.1
State 0.0 (0.3) (0.1)
Total Current 0.0 (18.3) 0.0
Deferred:      
Federal 0.0 0.0 0.0
State 0.0 0.0 0.0
Total Deferred 0.0 0.0 0.0
Income tax expense (benefit) $ 0.0 $ (18.3) $ 0.0