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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Net Income $ 97.0 $ 98.4 $ 600.4 $ 482.5
Other comprehensive income:        
Net unrealized loss on available-for-sale securities [1] 3.5 (1.7) 3.2 (0.9)
Net unrealized gain (loss) on cash flow hedges [2] (0.1) (0.1) (0.3) (0.2)
Unrecognized pension and OPEB benefit (costs) [3] 0.6 0.7 1.1 1.3
Total other comprehensive income (loss) 4.0 (1.1) 4.0 0.2
Comprehensive Income $ 101.0 $ 97.3 $ 604.4 $ 482.7
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $0.9 million tax expense and $0.4 million tax benefit in the third quarter of 2024 and 2023, respectively, and $0.8 million of tax expense and $0.2 million tax benefit for the nine months ended 2024 and 2023, respectively.
[2] adjustment for cash flow hedges, net of $0.1 million tax benefit and $0.0 million tax expense in the third quarter of 2024 and 2023, respectively, and $0.1 million of tax benefit and $0.1 million tax benefit for the nine months ended 2024 and 2023, respectively.
[3] Unrecognized pension and OPEB benefit, net of $0.2 million of tax expense and $0.3 million tax expense in the third quarter of 2024 and 2023, respectively, and $0.4 million of tax expense and $0.5 million tax expense for the nine months ended 2024 and 2023, respectively.