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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Net Income $ 75.6 $ 218.9
Other comprehensive income (loss):    
Net unrealized gain (loss) on available-for-sale securities [1] (5.4) 2.8
Net unrealized gain (loss) on cash flow hedges [2] (133.3) (19.3)
Unrecognized pension and OPEB benefit [3] 0.7 0.9
Total other comprehensive income (loss) [4] (138.0) (15.6)
Comprehensive Income (Loss) $ (62.4) $ 203.3
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $1.4 million tax benefit and $0.7 million tax expense in the first quarter of 2020 and 2019, respectively.
[2] Net unrealized gain (loss) on cash flow hedges, net of $44.1 million and $6.5 million tax benefit in the first quarter of 2020 and 2019, respectively.
[3] Unrecognized pension and OPEB benefit, net of $0.3 million tax benefit and $0.4 million tax expense in the first quarter of 2020 and 2019, respectively.
[4] All amounts are net of tax. Amounts in parentheses indicate debits.