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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax $ 0.3 $ 1.2 $ 87.1  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 2.9 2.3 2.6  
Net current-period other comprehensive income (loss) 3.2 3.5 89.7  
Accumulated other comprehensive loss (30.4) (33.6) (37.1) $ (126.8)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1.5 3.1 (13.7)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.8 0.8 0.4  
Net current-period other comprehensive income (loss) 3.3 3.9 (13.3)  
Accumulated other comprehensive loss (4.0) (7.3) (11.2) 2.1
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0.0 (0.5) 109.7  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (0.4) 0.3 0.2  
Net current-period other comprehensive income (loss)   (0.2) 109.9  
Accumulated other comprehensive loss (13.2) (12.8) (12.6) (122.5)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1.2) (1.4) (8.9)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1.5 1.2 2.0  
Net current-period other comprehensive income (loss) 0.3 (0.2) (6.9)  
Accumulated other comprehensive loss $ (13.2) $ (13.5) $ (13.3) $ (6.4)