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Employee Benefit Plans and Other Postretirement Benefits - Summary of Changes in Pension Plans' Level 3 Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Level 3 fair value of pension plans' assets [Roll Forward] |  |
Plan assets at fair value at beginning of period | $ 1,100.0 |
Fair value of plan assets at plan year end | 267.2 | $ 1,100.0
Pension Plans |  |
Level 3 fair value of pension plans' assets [Roll Forward] |  |
Plan assets at fair value at beginning of period | 1,055.3 | 1,382.7
Fair value of plan assets at plan year end | $ 1,161.6 | $ 1,055.3

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