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Pension and Postretirement Benefit Costs - Schedule of Net Periodic Benefit (Benefit) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Net periodic postretirement benefit credit $ (7.4) $ (10.1)
Postretirement benefit plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned 0.1 0.1
Interest cost on accumulated postretirement benefit obligation 2.0 2.3
Expected return on plan assets (0.1) (0.1)
Amortization of prior service credit (10.2) (13.2)
Net periodic postretirement benefit credit $ (8.2) $ (10.9)