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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)

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