Employee Benefit Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3.1	$ 3.6	$ 6.3	$ 7.2
Interest cost	13.9	14.0	27.7	28.0
Expected return on plan assets	(16.5)	(14.3)	(32.9)	(28.6)
Net amortization of unrecognized amounts, Prior service cost	1.4	1.3	2.7	2.6
Net amortization of unrecognized amounts, Actuarial loss	0.2	1.1	0.4	2.1
Net periodic benefit cost	$ 2.1	$ 5.7	$ 4.2	$ 11.3