Employee Benefit Plans and Other Postretirement Benefits - Summary of Changes in Pension Plans' Level 3 Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Level 3 fair value of pension plans' assets [Roll Forward]
Plan assets at fair value at beginning of period	$ 0.0
Fair value of plan assets at plan year end	0.0	$ 0.0
Pension Plans
Level 3 fair value of pension plans' assets [Roll Forward]
Plan assets at fair value at beginning of period	1,133.4	1,161.6
Fair value of plan assets at plan year end	$ 1,155.1	$ 1,133.4