Employee Benefit Plans - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
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