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Summary of Significant Accounting Policies - Summary of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax | $ (10.8) | $ (17.0) | $ (11.9) | $ (24.8)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent | 1.1 | 7.8 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.2 | 0.4 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member] |  |  |  |
Accumulated other comprehensive loss, net of tax | (17.3) | (18.3) | (18.5) | (26.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.3 | 0.4 |  |
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Accumulated other comprehensive loss, net of tax | 6.5 | 1.3 | $ 6.6 | $ 1.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (0.1) | 0.0 |  |
Settlement Cost [Member] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0.9 | 7.4 |  |
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 | 0.9 | 7.4 |  |
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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