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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax $ 28.4 $ (64.6) $ (55.9)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.5 0.5 0.5  
Net current-period other comprehensive income (loss) 29.9 (64.1) (55.4)  
Accumulated other comprehensive loss (126.8) (156.7) (92.6) $ (37.2)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (3.5) 3.3 6.1  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (0.4) (0.6) (0.4)  
Net current-period other comprehensive income (loss) (3.9) 2.7 5.7  
Accumulated other comprehensive loss 2.1 6.0 3.3 (2.4)
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 25.3 (70.8) (64.3)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.1 0.1 0.1  
Net current-period other comprehensive income (loss)   (70.7) (64.2)  
Accumulated other comprehensive loss (122.5) (147.9) (77.2) (13.0)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 6.6 2.9 2.3  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.8 1.0 0.8  
Net current-period other comprehensive income (loss) 8.4 3.9 3.1  
Accumulated other comprehensive loss $ (6.4) $ (14.8) $ (18.7) $ (21.8)