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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss, Net of Tax (Parenthetical) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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(Loss) gain on derivative instruments, net of income tax benefit of $(22.7) and $(5.3), respectively |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ (22.7) | $ (5.3)
Accumulated Gain Loss Net Cash Flow Hedge Parent Member |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Accumulated other comprehensive loss, income taxes | 19.1 | 19.1
Gain On Interest Rate Swap Net Of Income Taxe Member |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Accumulated other comprehensive loss, income taxes | 0.3 | 0.4
Defined benefit pension plans and Retiree health care plan | Defined benefit pension plans, net of income benefit of $(20.4) and $(22.8), respectively |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Accumulated other comprehensive loss, income taxes | (23.0) | (20.4)
Defined benefit pension plans and Retiree health care plan | Retiree health care plan, net of income taxes of $1.9 and $1.6, respectively |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |
Accumulated other comprehensive loss, income taxes | $ 2.0 | $ 1.9

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