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Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Pension Plan |  |
Recognized in accumulated other comprehensive income (loss) as of end of period (net of taxes) |  |
Net actuarial loss | $ 35.2 | $ 27.8
Prior service (cost) benefit | (8.1) | (9.6)
Total | 27.1 | 18.2
Postretirement Health and Other |  |
Recognized in accumulated other comprehensive income (loss) as of end of period (net of taxes) |  |
Net actuarial loss | (3.1) | 2.7
Prior service (cost) benefit | 9.0 | 10.2
Total | $ 5.9 | $ 12.9

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