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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance $ 10,996.9 $ 9,819.6 $ 10,668.3 $ 10,136.3
Other Comprehensive Income (Loss) before reclassifications 15.1 3.8 17.0 2.7
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.2 0.4 1.3
Net current-period other comprehensive income (loss) 15.2 4.0 17.4 4.0
Ending balance 11,241.8 10,328.8 11,241.8 10,328.8
Interest Rate Risk        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net current-period other comprehensive income (loss)     (0.3)  
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (28.2) (33.6) (30.4) (33.6)
Net current-period other comprehensive income (loss) 15.2   17.4  
Ending balance (13.0) (29.6) (13.0) (29.6)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (2.2) (7.6) (4.0) (7.3)
Other Comprehensive Income (Loss) before reclassifications 1.3 3.5 3.1 2.8
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.0 0.4
Net current-period other comprehensive income (loss) 1.3 3.5 3.1 3.2
Ending balance (0.9) (4.1) (0.9) (4.1)
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (13.4) (13.0) (13.2) (12.8)
Other Comprehensive Income (Loss) before reclassifications 0.0 0.4 0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss) (0.1) (0.5) (0.3) (0.3)
Net current-period other comprehensive income (loss) (0.1) (0.1)   (0.3)
Ending balance (13.5) (13.1) (13.5) (13.1)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (12.6) (13.0) (13.2) (13.5)
Other Comprehensive Income (Loss) before reclassifications 13.8 (0.1) 13.9 (0.1)
Amounts reclassified from accumulated other comprehensive income (loss) 0.2 0.7 0.7 1.2
Net current-period other comprehensive income (loss) 14.0 0.6 14.6 1.1
Ending balance $ 1.4 $ (12.4) $ 1.4 $ (12.4)