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Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated other comprehensive income (loss) |  |  | $ (7.2) | $ (11.9)
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.2 | 0.7
Settlement cost | $ 0.0 | $ 0.0 | 0.0 | 1.1
Regulatory classification of certain pension costs |  |  | 3.9 |
Accumulated other comprehensive income (loss) | (3.1) | (10.1) | (3.1) | (10.1)
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) |  |  | 0.3 | 0.8
Settlement cost |  |  |  | 1.1
Regulatory classification of certain pension costs |  |  | 3.9 |
Accumulated other comprehensive income (loss) | (8.7) | (16.6) | (8.7) | (16.6)
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 | $ 5.6 | $ 6.5

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