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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net Income $ 400.3 $ 337.8
Other comprehensive income:    
Net unrealized loss on available-for-sale securities [1] (0.3) 2.0
Net unrealized gain (loss) on cash flow hedges [2] (0.1) 0.1
Unrecognized pension and OPEB benefit (costs) [3] 0.2 0.3
Total other comprehensive income (loss) (0.2) 2.4
Comprehensive Income $ 400.1 $ 340.2
[1] Net unrealized loss on available-for-sale debt securities, net of $0.1 million tax benefit and $0.5 million tax expense in the first quarter of 2024 and 2023, respectively.
[2] adjustment for cash flow hedges, net of $0.0 million tax benefit and $0.1 million tax benefit in the first quarter of 2024 and 2023, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.1 million of tax expense and $0.1 million tax expense in the first quarter of 2024 and 2023, respectively.