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Summary of Significant Accounting Policies - Summary of Amount Reclassified Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent |  | $ (0.5) | $ (0.9) | $ (1.6) | $ (8.7)
Pension Plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | [1] | (0.3) | (0.4) | (0.6) | (0.8)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | [1] | 0.0 | 0.0 | (0.1) | (0.1)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax | [1] | (0.3) | (0.9) | (1.4) | (10.5)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | (0.6) | (1.3) | (2.1) | (11.4)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | (0.1) | (0.4) | (0.4) | (2.7)
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | (0.5) | (0.9) | (1.7) | (8.7)
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | [1] | 0.0 | 0.0 | (0.1) | 0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax |  | 0.0 | 0.0 | 0.1 | 0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax |  | 0.0 | 0.0 | 0.0 | 0.0
Amounts reclassified from accumulated other comprehensive income (loss), net of tax |  | $ 0.0 | $ 0.0 | $ 0.1 | $ 0.0
[1] | These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost (see Note 10 for additional information).

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