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Pension and Postretirement Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Net (gain) loss recognized due to settlement $ 18.5 $ 0.0 $ 0.0
Pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 8.2 9.6 12.8
Interest cost 27.8 29.3 14.8
Expected return on plan assets 30.8 30.4 16.9
Amortization of net actuarial losses 1.4 9.4 8.7
Amortization of prior service cost 10.5 1.5 0.1
Net (gain) loss recognized due to settlement 18.8 0.4 (0.4)
Curtailment (gain) loss (0.2) 0.0 0.0
Net annual postretirement benefit cost $ 35.7 $ 19.8 $ 19.1
Weighted average discount rate 4.50% 4.90% 1.90%
Postretirement benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.1 $ 0.1
Interest cost 1.5 1.3 0.9
Amortization of prior service cost 0.1 0.2 0.1
Net annual postretirement benefit cost $ 1.6 $ 1.6 $ 1.1
Weighted average discount rate 6.70% 6.60% 4.10%