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Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Accumulated other comprehensive income (loss) | $ (7.2) | $ (11.9)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.2
Settlement cost | 0.0 | 0.9
Regulatory classification of certain pension costs | 3.9 |
Accumulated other comprehensive income (loss) | (3.3) | (10.8)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |
Accumulated other comprehensive income (loss) | (12.9) | (18.5)
Amounts reclassified from accumulated other comprehensive income (loss) | 0.1 | 0.3
Settlement cost |  | 0.9
Regulatory classification of certain pension costs | 3.9 |
Accumulated other comprehensive income (loss) | (8.9) | (17.3)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |
Accumulated other comprehensive income (loss) | 5.7 | 6.6
Amounts reclassified from accumulated other comprehensive income (loss) | (0.1) | (0.1)
Settlement cost |  | 0.0
Regulatory classification of certain pension costs | 0.0 |
Accumulated other comprehensive income (loss) | $ 5.6 | $ 6.5

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