v3.26.3
Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 5.3 $ 4.9 $ 15.8 $ 14.7
Interest cost 14.0 16.0 42.2 48.0
Expected return on assets (22.5) (23.1) (67.5) (69.3)
Amortization of prior service credit 0.0 0.0 0.0 0.0
Recognized actuarial loss 5.9 6.4 17.7 19.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 4.7 5.6 4.7 5.6
Total Net Periodic Benefits Cost 7.4 9.8 12.9 18.2
Other Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 0.9 1.0 2.6 3.0
Interest cost 4.5 5.6 13.7 16.8
Expected return on assets (4.1) (4.2) (12.4) (12.6)
Amortization of prior service credit (1.1) (0.4) (3.4) (1.2)
Recognized actuarial loss 0.1 0.4 0.2 1.2
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0.0 0.0 0.0  
Total Net Periodic Benefits Cost $ 0.3 $ 2.4 $ 0.7 $ 7.2