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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (33.6) $ (37.1)
Other Comprehensive Income (Loss) before reclassifications (0.9) 1.7
Amounts reclassified from accumulated other comprehensive income (loss) 0.7 0.7
Net current-period other comprehensive income (loss) (0.2) 2.4
Ending Balance (33.8) (34.7)
Gains and Losses on Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (7.3) (11.2)
Other Comprehensive Income (Loss) before reclassifications (0.6) 1.7
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.3
Net current-period other comprehensive income (loss) (0.3) 2.0
Ending Balance (7.6) (9.2)
Gains and Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (12.8) (12.6)
Other Comprehensive Income (Loss) before reclassifications (0.2) 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.1 0.1
Net current-period other comprehensive income (loss) (0.1) 0.1
Ending Balance (12.9) (12.5)
Pension and OPEB Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (13.5) (13.3)
Other Comprehensive Income (Loss) before reclassifications (0.1) 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.3 0.3
Net current-period other comprehensive income (loss) 0.2 0.3
Ending Balance $ (13.3) $ (13.0)