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Other Postretirement Benefit Plans - Schedule of Net Periodic Benefit Cost Information and the Related Assumptions Used to Measure the Net Periodic Benefit Cost (Details) - Postretirement Plan - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.1 $ 0.1 $ 0.2
Interest cost 1.7 1.9 1.4
Amortization of prior service credit (8.2) (8.3) (10.1)
Recognition of net actuarial gains (0.5) (1.0) (13.1)
Net periodic benefit cost (credit) $ (6.9) $ (7.3) $ (21.6)