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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Net Income $ 63.5 $ 62.2 $ 550.6 $ 415.6
Other comprehensive income:        
Net unrealized loss on available-for-sale securities [1] (4.5) (0.8) (14.1) (2.4)
Net unrealized gain (loss) on cash flow hedges [2] 16.2 6.6 119.2 41.4
Unrecognized pension and OPEB benefit (costs) [3] 0.6 0.4 (1.8) 0.3
Total other comprehensive income 12.3 6.2 103.3 39.3
Comprehensive Income $ 75.8 $ 68.4 $ 653.9 $ 454.9
[1] Net unrealized loss on available-for-sale debt securities, net of $1.1 million and $0.2 million tax benefit in the third quarter of 2022 and 2021, respectively, and $3.7 million and $0.6 million tax benefit for the nine months ended 2022 and 2021, respectively.
[2] Net unrealized gain on cash flow hedges, net of $5.3 million and $2.2 million tax expense in the third quarter of 2022 and 2021, respectively, and $39.4 million and $13.7 million tax expense for the nine months ended 2022 and 2021, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.2 million and $0.2 million tax expense in the third quarter of 2022 and 2021, respectively, and $0.6 million tax benefit and $1.3 million tax expense for the nine months ended 2022 and 2021, respectively.