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Savings, Pension and Other Postretirement Employee Benefit Plans - Pre-tax Components of Net Periodic Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost $ 0.3    
Pension Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 2.5 $ 3.5 $ 2.2
Interest cost 11.9 12.5 8.9
Expected return on plan assets (15.7) (15.2) (11.3)
Amortization of actuarial loss 0.1 0.1 6.2
Net periodic cost (1.2) 0.8 5.9
Other Postretirement Employee Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.2 0.2 0.3
Interest cost 2.5 2.8 2.1
Expected return on plan assets 0.0 0.0 0.0
Amortization of actuarial loss (0.5) (0.4) 0.0
Net periodic cost 2.2 $ 2.6 $ 2.4
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment $ (1.9)