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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     $ (1.7)  
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 4,900,000 $ 5,500,000 14,700,000 $ 16,400,000
Interest cost 16,000,000.0 16,300,000 48,000,000.0 48,900,000
Expected return on assets (23,100,000) (23,800,000) (69,300,000) (71,400,000)
Amortization of prior service credit 0 0 0 0
Recognized actuarial loss 6,400,000 7,200,000 19,200,000 21,600,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 5,600,000 5,900,000 5,600,000 5,900,000
Total Net Periodic Benefits Cost 9,800,000 11,100,000 18,200,000 21,400,000
Other Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1,000,000.0 1,300,000 3,000,000.0 3,900,000
Interest cost 5,600,000 5,500,000 16,800,000 16,400,000
Expected return on assets (4,200,000) (4,000,000.0) (12,600,000) (12,000,000.0)
Amortization of prior service credit (400,000) (400,000) (1,200,000) (1,200,000)
Recognized actuarial loss 400,000 800,000 1,200,000 2,400,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0   0
Total Net Periodic Benefits Cost $ 2,400,000 $ 3,200,000 $ 7,200,000 $ 9,500,000