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Pension and Other Postretirement Benefits - Change in Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Pension    
Change in fair value of plan assets [Roll Forward]    
Fair value of plan assets at beginning of year $ 256.8 $ 216.6
Actual return on plan assets 6.8 21.4
Acquisition 0.0 31.5
Employer contributions 2.3 6.6
Medicare Part D subsidy received 0.0 0.0
Benefits paid (21.5) (19.9)
Exchange rates (0.3) (0.6)
Plan participants' contributions 1.0 1.2
Fair value of assets at end of year 245.1 256.8
OPEB    
Change in fair value of plan assets [Roll Forward]    
Fair value of plan assets at beginning of year 0.0 0.0
Actual return on plan assets 0.0 0.0
Acquisition 0.0 0.0
Employer contributions 5.5 6.5
Medicare Part D subsidy received 0.2 0.3
Benefits paid (5.7) (6.8)
Exchange rates 0.0 0.0
Plan participants' contributions 0.0
Fair value of assets at end of year $ 0.0 $ 0.0