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
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