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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ (33.8) $ (34.7) $ (33.6) $ (37.1)
Other Comprehensive Income (Loss) before reclassifications (0.3) (1.7) (1.1) 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.5 0.6 1.1 1.3
Net current-period other comprehensive income (loss) 0.2 (1.1) 0.0 1.3
Ending Balance (33.6) (35.8) (33.6) (35.8)
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 (7.6) (9.2) (7.3) (11.2)
Other Comprehensive Income (Loss) before reclassifications (0.1) (1.4) (0.7) 0.3
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.2 0.4 0.5
Net current-period other comprehensive income (loss) 0.0 (1.2) (0.3) 0.8
Ending Balance (7.6) (10.4) (7.6) (10.4)
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (12.9) (12.5) (12.8) (12.6)
Other Comprehensive Income (Loss) before reclassifications (0.2) (0.3) (0.4) (0.3)
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.1 0.2 0.2
Net current-period other comprehensive income (loss) (0.1) (0.2)   (0.1)
Ending Balance (13.0) (12.7) (13.0) (12.7)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (13.3) (13.0) (13.5) (13.3)
Other Comprehensive Income (Loss) before reclassifications 0.0 0.0 0.0 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.3 0.5 0.6
Net current-period other comprehensive income (loss) 0.3 0.3 0.5 0.6
Ending Balance $ (13.0) $ (12.7) $ (13.0) $ (12.7)