Pension and Postretirement Plans - Schedule of Pension and Postretirement (Benefits) Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0.0	$ 0.0
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation	3.9	5.1
Expected return on plan assets	(4.0)	(5.7)
Amortization of:
Prior service benefit	0.0	0.0
Actuarial gain	(0.1)	0.0
Pension settlement gain	(1.0)	0.0
Postretirement curtailment gain	0.0	0.0
Pension/postretirement (benefit) cost	(1.2)	(0.6)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0.1	0.1
Other components of pension and postretirement benefit plans expense:
Interest cost on projected benefit obligation	1.3	1.2
Expected return on plan assets	0.0	0.0
Amortization of:
Prior service benefit	(0.2)	(0.2)
Actuarial gain	(1.1)	(0.9)
Pension settlement gain	0.0	0.0
Postretirement curtailment gain	(0.2)	0.0
Pension/postretirement (benefit) cost	$ (0.1)	$ 0.2