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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Net Income $ 98.4 $ 63.5 $ 482.5 $ 550.6
Other comprehensive income:        
Net unrealized loss on available-for-sale securities [1] (1.7) (4.5) (0.9) (14.1)
Net unrealized gain (loss) on cash flow hedges [2] (0.1) 16.2 (0.2) 119.2
Unrecognized pension and OPEB benefit (costs) [3] 0.7 0.6 1.3 (1.8)
Total other comprehensive income (loss) (1.1) 12.3 0.2 103.3
Comprehensive Income $ 97.3 $ 75.8 $ 482.7 $ 653.9
[1] Net unrealized loss on available-for-sale debt securities, net of $0.4 million tax benefit and $1.1 million tax benefit in the third quarter of 2023 and 2022, respectively, and $0.2 million of tax benefit and $3.7 million tax benefit for the nine months ended 2023 and 2022, respectively.
[2] adjustment for cash flow hedges, net of $0.0 million tax expense and $5.3 million tax expense in the third quarter of 2023 and 2022, respectively , and $0.1 million of tax benefit and $39.4 million tax expense for the nine months ended 2023 and 2022, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.3 million of tax expense and $0.2 million tax expense in the third quarter of 2023 and 2022, respectively, and $0.5 million of tax expense and $0.6 million tax benefit for the nine months ended 2023 and 2022, respectively.