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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (35.8) $ (35.8) $ (37.1) $ (126.8)
Other Comprehensive Income (Loss) before reclassifications (2.2) 11.6 (1.6) 101.4
Amounts reclassified from accumulated other comprehensive income (loss) 1.1 0.7 1.8 1.9
Net current-period other comprehensive income (loss) (1.1) 12.3 0.2 103.3
Ending Balance (36.9) (23.5) (36.9) (23.5)
Interest Rate Risk        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net current-period other comprehensive income (loss)     (0.2)  
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (10.4) (7.5) (11.2) 2.1
Other Comprehensive Income (Loss) before reclassifications (1.7) (4.6) (1.4) (14.4)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.1 0.5 0.3
Net current-period other comprehensive income (loss) (1.7) (4.5) (0.9) (14.1)
Ending Balance (12.1) (12.0) (12.1) (12.0)
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (12.7) (19.5) (12.6) (122.5)
Other Comprehensive Income (Loss) before reclassifications (0.4) 16.2 (0.4) 119.1
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.0 0.2 0.1
Net current-period other comprehensive income (loss) (0.1) 16.2   119.2
Ending Balance (12.8) (3.3) (12.8) (3.3)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (12.7) (8.8) (13.3) (6.4)
Other Comprehensive Income (Loss) before reclassifications (0.1) 0.0 0.2 (3.3)
Amounts reclassified from accumulated other comprehensive income (loss) 0.8 0.6 1.1 1.5
Net current-period other comprehensive income (loss) 0.7 0.6 1.3 (1.8)
Ending Balance $ (12.0) $ (8.2) $ (12.0) $ (8.2)