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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (10.1) | $ (14.4) | $ (10.1) | $ (14.4) | $ (11.9) | $ (24.8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 0.2 | 1.7 | 1.8 | 10.4 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0.7 | 0.9 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax | (16.6) | (15.6) | (16.6) | (15.6) | (18.5) | (26.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 0.8 | 1.0 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax | $ 6.5 | $ 1.2 | 6.5 | 1.2 | $ 6.6 | $ 1.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | (0.1) | (0.1) |  |
Settlement Cost [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 1.1 | 9.5 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | 1.1 | 9.5 |  |
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  | $ 0.0 | $ 0.0 |  |

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