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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Net Income $ 46.3 $ 55.8 $ 384.1 $ 487.1
Other comprehensive income:        
Net unrealized loss on available-for-sale securities [1] (1.2) (3.9) 0.8 (9.6)
Net unrealized gain (loss) on cash flow hedges [2] (0.2) 56.0 (0.1) 103.0
Unrecognized pension and OPEB benefit (costs) [3] 0.3 (2.5) 0.6 (2.4)
Total other comprehensive income (loss) (1.1) 49.6 1.3 91.0
Comprehensive Income $ 45.2 $ 105.4 $ 385.4 $ 578.1
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $0.3 million tax benefit and $1.1 million tax benefit in the second quarter of 2023 and 2022, respectively, and $0.2 million of tax expense and $2.6 million tax benefit for the six months ended 2023 and 2022, respectively.
[2] adjustment for cash flow hedges, net of $0.0 million tax expense and $12.8 million tax expense in the second quarter of 2023 and 2022, respectively , and $0.1 million of tax benefit and $34.1 million tax expense for the six months ended 2023 and 2022, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.1 million of tax expense and $0.8 million tax benefit in the second quarter of 2023 and 2022, respectively, and $0.2 million of tax expense and $0.8 million tax benefit for the six months ended 2023 and 2022, respectively.