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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (126.8) $ (156.7)
Other Comprehensive Income (Loss) before reclassifications 41.1 81.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.2
Net current-period other comprehensive income (loss) 41.4 81.2
Ending Balance (85.4) (75.5)
Gains and Losses on Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 2.1 6.0
Other Comprehensive Income (Loss) before reclassifications (5.9) (2.2)
Amounts reclassified from accumulated other comprehensive income (loss) 0.2 (0.3)
Net current-period other comprehensive income (loss) (5.7) (2.5)
Ending Balance (3.6) 3.5
Gains and Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (122.5) (147.9)
Other Comprehensive Income (Loss) before reclassifications 47.0 84.6
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Net current-period other comprehensive income (loss) 47.0 84.6
Ending Balance (75.5) (63.3)
Pension and OPEB Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (6.4) (14.8)
Other Comprehensive Income (Loss) before reclassifications 0.0 (1.4)
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.5
Net current-period other comprehensive income (loss) 0.1 (0.9)
Ending Balance $ (6.3) $ (15.7)