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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (37.1) $ (126.8)
Other Comprehensive Income (Loss) before reclassifications 1.7 41.1
Amounts reclassified from accumulated other comprehensive income (loss) 0.7 0.3
Net current-period other comprehensive income (loss) 2.4 41.4
Ending Balance (34.7) (85.4)
Gains and Losses on Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (11.2) 2.1
Other Comprehensive Income (Loss) before reclassifications 1.7 (5.9)
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.2
Net current-period other comprehensive income (loss) 2.0 (5.7)
Ending Balance (9.2) (3.6)
Gains and Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (12.6) (122.5)
Other Comprehensive Income (Loss) before reclassifications 0.0 47.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.0
Net current-period other comprehensive income (loss) 0.1 47.0
Ending Balance (12.5) (75.5)
Pension and OPEB Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (13.3) (6.4)
Other Comprehensive Income (Loss) before reclassifications 0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.1
Net current-period other comprehensive income (loss) 0.3 0.1
Ending Balance $ (13.0) $ (6.3)