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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Net Income $ 56.9 $ (4.7) $ 353.4 $ 70.9
Other comprehensive income (loss):        
Net unrealized loss on available-for-sale securities [1] 0.9 5.7 (1.6) 0.3
Net unrealized gain (loss) on cash flow hedges [2] (49.8) 2.7 34.8 (130.6)
Unrecognized pension and OPEB benefit (costs) [3] 0.8 0.3 (0.1) 1.0
Total other comprehensive income (loss) (48.1) 8.7 33.1 (129.3)
Comprehensive Income (Loss) $ 8.8 $ 4.0 $ 386.5 $ (58.4)
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $0.3 million and $1.5 million tax expense in the second quarter of 2021 and 2020, respectively, and $0.4 million tax benefit and $0.1 million tax expense for the six months ended 2021 and 2020, respectively.
[2] Net unrealized gain (loss) on cash flow hedges, net of $16.5 million tax benefit and $0.9 million tax expense in the second quarter of 2021 and 2020, respectively , and $11.5 million tax expense and $43.2 million tax benefit for the six months ended 2021 and 2020, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.2 million tax expense in the second quarter of 2021 and 2020, and $1.1 million tax expense and $0.1 million tax benefit for the six months ended 2021 and 2020, respectively.