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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax [1] $ 48.4 $ (21.7) $ 7.6  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] (32.7) 3.4 2.4  
Net current-period other comprehensive income (loss) [1] 15.7 (18.3) 10.0  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets [1] (9.5)      
Accumulated other comprehensive loss [1] (37.2) (43.4) (25.1) $ (35.1)
Gains and Losses on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax [1] (3.0) 0.6 0.0  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 0.4 0.2 (0.1)  
Net current-period other comprehensive income (loss) [1] (2.6) 0.8 (0.1)  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets [1] 0.0      
Accumulated other comprehensive loss [1] (2.4) 0.2 (0.6) (0.5)
Gains and Losses on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax [1] 55.8 (24.2) 7.1  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] (33.1) 1.7 1.5  
Net current-period other comprehensive income (loss) [1] 22.7 (22.5) 8.6  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets [1] (6.3)      
Accumulated other comprehensive loss [1] (13.0) (29.4) (6.9) (15.5)
Pension and OPEB Items        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax [1] (4.4) 1.9 0.5  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [1] 0.0 1.5 1.0  
Net current-period other comprehensive income (loss) [1] (4.4) 3.4 1.5  
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets [1] (3.2)      
Accumulated other comprehensive loss [1] $ (21.8) $ (14.2) $ (17.6) $ (19.1)
[1] All amounts are net of tax. Amounts in parentheses indicate debits.