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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax $ 87.1 $ 28.4 $ (64.6)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2.6 1.5 0.5  
Net current-period other comprehensive income (loss) 89.7 29.9 (64.1)  
Accumulated other comprehensive loss (37.1) (126.8) (156.7) $ (92.6)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (13.7) (3.5) 3.3  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.4 (0.4) (0.6)  
Net current-period other comprehensive income (loss) (13.3) (3.9) 2.7  
Accumulated other comprehensive loss (11.2) 2.1 6.0 3.3
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 109.7 25.3 (70.8)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.2 0.1 0.1  
Net current-period other comprehensive income (loss)   25.4 (70.7)  
Accumulated other comprehensive loss (12.6) (122.5) (147.9) (77.2)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (8.9) 6.6 2.9  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2.0 1.8 1.0  
Net current-period other comprehensive income (loss) (6.9) 8.4 3.9  
Accumulated other comprehensive loss $ (13.3) $ (6.4) $ (14.8) $ (18.7)