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Income Taxes: Current and Deferred Income Tax Expense (Benefit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Current:      
Federal $ (0.8) $ (0.5) $ 0.6
State 1.0 0.1 (0.7)
Current income tax (benefit) 0.2 (0.4) (0.1)
Deferred:      
Federal 30.9 23.2 2.2
State (5.5) 2.4 5.1
Deferred income tax expense 25.4 25.6 7.3
Income tax expense $ 25.6 $ 25.2 $ 7.2