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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] $ (25.1) $ (35.1)
Other Comprehensive Income before reclassifications [1] 4.9 (69.4)
Amounts reclassified from accumulated other comprehensive loss [1] 0.6 0.7
Net current-period other comprehensive income (loss) [1] 5.5 (68.7)
Ending Balance [1] (19.6) (103.8)
Gains and Losses on Securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] (0.6) (0.5)
Other Comprehensive Income before reclassifications [1] 0.2 1.7
Amounts reclassified from accumulated other comprehensive loss [1] 0.2 0.0
Net current-period other comprehensive income (loss) [1] 0.4 1.7
Ending Balance [1] (0.2) 1.2
Gains and Losses on Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] (6.9) (15.5)
Other Comprehensive Income before reclassifications [1] 4.6 (71.2)
Amounts reclassified from accumulated other comprehensive loss [1] 0.3 0.5
Net current-period other comprehensive income (loss) [1] 4.9 (70.7)
Ending Balance [1] (2.0) (86.2)
Pension and OPEB Items    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance [1] (17.6) (19.1)
Other Comprehensive Income before reclassifications [1] 0.1 0.1
Amounts reclassified from accumulated other comprehensive loss [1] 0.1 0.2
Net current-period other comprehensive income (loss) [1] 0.2 0.3
Ending Balance [1] $ (17.4) $ (18.8)
[1] All amounts are net of tax. Amounts in parentheses indicate debits.