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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance [1] $ (221.9) $ (80.8) $ (92.6) $ (37.2)
Other Comprehensive Income before reclassifications [1] 28.2 (49.6) (101.2) (93.9)
Amounts reclassified from accumulated other comprehensive loss [1] 0.1 0.1 0.2 0.8
Net current-period other comprehensive income (loss) [1] 28.3 (49.5) (101.0) (93.1)
Ending Balance [1] (193.6) (130.3) (193.6) (130.3)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance [1] 3.6 2.5 3.3 (2.4)
Other Comprehensive Income before reclassifications [1] 1.2 0.9 2.0 5.9
Amounts reclassified from accumulated other comprehensive loss [1] 0.2 (0.2) (0.3) (0.3)
Net current-period other comprehensive income (loss) [1] 1.4 0.7 1.7 5.6
Ending Balance [1] 5.0 3.2 5.0 3.2
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance [1] (207.8) (62.8) (77.2) (13.0)
Other Comprehensive Income before reclassifications [1] 26.0 (50.7) (104.6) (100.5)
Amounts reclassified from accumulated other comprehensive loss [1] 0.0 0.1 0.0 0.1
Net current-period other comprehensive income (loss) [1] 26.0 (50.6) (104.6) (100.4)
Ending Balance [1] (181.8) (113.4) (181.8) (113.4)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance [1] (17.7) (20.5) (18.7) (21.8)
Other Comprehensive Income before reclassifications [1] 1.0 0.2 1.4 0.7
Amounts reclassified from accumulated other comprehensive loss [1] (0.1) 0.2 0.5 1.0
Net current-period other comprehensive income (loss) [1] 0.9 0.4 1.9 1.7
Ending Balance [1] $ (16.8) $ (20.1) $ (16.8) $ (20.1)
[1] All amounts are net of tax. Amounts in parentheses indicate debits.