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Income Tax Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current Income Tax Expense [Abstract]      
Federal [1] $ 0.0 $ 0.0 $ 0.0
State [1] 0.0 0.0 0.1
Total Current Income Tax Expense [1] 0.0 0.0 0.1
Deferred Income Tax Expense (Benefit) [Abstract]      
Federal [2] (37.2) (48.8) (27.8)
State 10.8 9.8 21.7
Investment Tax Credit Amortization (0.5) (0.5) (0.6)
Total Deferred Income Tax Expense (Benefit) (26.9) (39.5) (6.7)
Total Income Tax Expense (Benefit) $ (26.9) $ (39.5) $ (6.6)
[1] For the years ended December 31, 2021, 2020 and 2019, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation and related tax attributes from large wind projects. Federal and state NOLs are being carried forward to offset current and future taxable income.
[2] For the years ended December 31, 2021, 2020 and 2019, the federal tax benefit is primarily due to production tax credits.