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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net Income (Loss) $ (172.9) $ 6.6 $ (102.0) $ 522.4
Other comprehensive income (loss):        
Net unrealized gain (loss) on available-for-sale securities [1] 1.4 0.7 1.7 5.6
Net unrealized gain (loss) on cash flow hedges [2] 26.0 (50.6) (104.6) (100.4)
Unrecognized pension and OPEB benefit [3] 0.9 0.4 1.9 1.7
Total other comprehensive income (loss) [4] 28.3 (49.5) (101.0) (93.1)
Comprehensive Income (Loss) $ (144.6) $ (42.9) $ (203.0) $ 429.3
[1] Net unrealized gain on available-for-sale debt securities, net of $0.4 million and $0.1 million tax expense in the third quarter of 2020 and 2019, respectively, and $0.5 million and $1.4 million tax expense for the nine months ended 2020 and 2019, respectively.
[2] Net unrealized gain (loss) on cash flow hedges, net of $8.6 million tax expense and $16.7 million tax benefit in the third quarter of 2020 and 2019, respectively, and $34.6 million and $33.2 million tax benefit for the nine months ended 2020 and 2019, respectively.
[3] Unrecognized pension and OPEB benefit, net of $0.2 million and $0.1 million tax expense in the third quarter of 2020 and 2019, respectively, and $0.1 million and $0.6 million tax expense for the nine months ended 2020 and 2019, respectively.
[4] All amounts are net of tax. Amounts in parentheses indicate debits.