Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Components of Income Tax Expense (Benefit) (Details)

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Income Taxes - Summary of Components of Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current income taxes:      
Federal $ (1.1) $ 1.7  
State 2.2 3.7  
Total current 1.1 5.4  
Deferred income taxes:      
Federal   3.6  
State 0.1 0.1  
Total deferred 0.1 3.7  
Income tax expense (benefit) $ 1.2 $ 9.1 $ (0.2)