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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net Income $ 103.1 $ 46.3 $ 503.4 $ 384.1
Other comprehensive income:        
Net unrealized loss on available-for-sale securities [1] 0.0 (1.2) (0.3) 0.8
Net unrealized gain (loss) on cash flow hedges [2] (0.1) (0.2) (0.2) (0.1)
Unrecognized pension and OPEB benefit (costs) [3] 0.3 0.3 0.5 0.6
Total other comprehensive income (loss) 0.2 (1.1) 0.0 1.3
Comprehensive Income $ 103.3 $ 45.2 $ 503.4 $ 385.4
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $0.0 million tax expense and $0.3 million tax benefit in the second quarter of 2024 and 2023, respectively, and $0.1 million of tax benefit and $0.2 million tax expense for the six months ended 2024 and 2023, respectively.
[2] adjustment for cash flow hedges, net of $0.0 million tax benefit and $0.0 million tax expense in the second quarter of 2024 and 2023, respectively, and $0.0 million of tax benefit and $0.1 million tax benefit for the six months ended 2024 and 2023, respectively.
[3] Unrecognized pension and OPEB benefit, net of $0.1 million of tax expense and $0.1 million tax expense in the second quarter of 2024 and 2023, respectively, and $0.2 million of tax expense and $0.2 million tax expense for the six months ended 2024 and 2023, respectively.