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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (33.6) $ (35.8) $ (33.6) $ (37.1)
Other Comprehensive Income (Loss) before reclassifications 3.8 (2.2) 2.7 (1.6)
Amounts reclassified from accumulated other comprehensive income (loss) 0.2 1.1 1.3 1.8
Net current-period other comprehensive income (loss) 4.0 (1.1) 4.0 0.2
Ending Balance (29.6) (36.9) (29.6) (36.9)
Interest Rate Risk        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net current-period other comprehensive income (loss)     (0.3)  
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (7.6) (10.4) (7.3) (11.2)
Other Comprehensive Income (Loss) before reclassifications 3.5 (1.7) 2.8 (1.4)
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0 0.4 0.5
Net current-period other comprehensive income (loss) 3.5 (1.7) 3.2 (0.9)
Ending Balance (4.1) (12.1) (4.1) (12.1)
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (13.0) (12.7) (12.8) (12.6)
Other Comprehensive Income (Loss) before reclassifications 0.4 (0.4) 0.0 (0.4)
Amounts reclassified from accumulated other comprehensive income (loss) (0.5) 0.3 (0.3) 0.2
Net current-period other comprehensive income (loss) (0.1) (0.1)   (0.2)
Ending Balance (13.1) (12.8) (13.1) (12.8)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (13.0) (12.7) (13.5) (13.3)
Other Comprehensive Income (Loss) before reclassifications (0.1) (0.1) (0.1) 0.2
Amounts reclassified from accumulated other comprehensive income (loss) 0.7 0.8 1.2 1.1
Net current-period other comprehensive income (loss) 0.6 0.7 1.1 1.3
Ending Balance $ (12.4) $ (12.0) $ (12.4) $ (12.0)