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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Income (Loss) $ 62.2 $ (172.9) $ 415.6 $ (102.0)
Other comprehensive income (loss):        
Net unrealized loss on available-for-sale securities [1] (0.8) 1.4 (2.4) 1.7
Net unrealized gain (loss) on cash flow hedges [2] 6.6 26.0 41.4 (104.6)
Unrecognized pension and OPEB benefit (costs) [3] 0.4 0.9 0.3 1.9
Total other comprehensive income (loss) 6.2 28.3 39.3 (101.0)
Comprehensive Income (Loss) $ 68.4 $ (144.6) $ 454.9 $ (203.0)
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $0.2 million tax benefit and $0.4 million tax expense in the third quarter of 2021 and 2020, respectively, and $0.6 million tax benefit and $0.5 million tax expense for the nine months ended 2021 and 2020, respectively.
[2] Net unrealized gain (loss) on cash flow hedges, net of $2.2 million and $8.6 million tax expense in the third quarter of 2021 and 2020, respectively, and $13.7 million tax expense and $34.6 million tax benefit for the nine months ended 2021 and 2020, respectively.
[3] Unrecognized pension and OPEB benefit, net of $0.2 million tax expense in the third quarter of 2021 and 2020, and $1.3 million and $0.1 million tax expense for the nine months ended 2021 and 2020, respectively.