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Statements of Consolidated Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net Income $ 211.3 $ 186.6
Other comprehensive income (loss):    
Net unrealized gain on available-for-sale securities [1] 0.4 1.7
Net unrealized gain (loss) on cash flow hedges [2] 4.9 (70.7)
Unrecognized pension and OPEB benefit [3] 0.2 0.3
Total other comprehensive income (loss) [4] 5.5 (68.7)
Comprehensive Income $ 216.8 $ 117.9
[1] Net unrealized gain on available-for-sale securities, net of $0.2 million and $0.9 million tax expense in the first quarter of 2017 and 2016, respectively.
[2] Net unrealized gain (loss) on derivatives qualifying as cash flow hedges, net of $3.0 million tax expense and $43.6 million tax benefit in the first quarter of 2017 and 2016, respectively.
[3] Unrecognized pension and OPEB benefit, net of $0.1 million tax expense in the first quarter of 2017 and 2016, respectively.
[4] All amounts are net of tax. Amounts in parentheses indicate debits.