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Income Taxes: Deferred Income Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred Tax Assets, Net [Abstract]    
Regulatory liabilities $ 74.0 $ 74.7
State tax credits 22.8 22.8
Federal NOL 146.6 192.0
State NOL 16.5 23.0
Partnership 12.2 12.8
Credit Carryovers 110.1 90.9
Other deferred tax assets 33.7 45.4
Less: Valuation allowance (15.4) (15.5)
Total deferred tax assets 400.5 446.1
Deferred tax liabilities:    
Accelerated depreciation, amortization and other plant-related differences (686.2) (645.7)
Regulatory assets (65.6) (94.4)
Goodwill (67.8) (57.9)
State deferred tax liability (84.5) (98.2)
Other deferred tax liabilities (44.4) (58.8)
Total deferred tax liabilities (948.5) (955.0)
Net deferred tax liability $ (548.0) $ (508.9)