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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net Income $ 107.0 $ 97.0 $ 734.2 $ 600.4
Other comprehensive income:        
Net unrealized loss on available-for-sale securities [1] 1.3 3.5 3.1 3.2
Net unrealized gain (loss) on cash flow hedges (0.1) (0.1) (0.3) (0.3)
Unrecognized pension and OPEB benefit (costs) [2] 14.0 0.6 14.6 1.1
Total other comprehensive income 15.2 4.0 17.4 4.0
Comprehensive Income $ 122.2 $ 101.0 $ 751.6 $ 604.4
[1] Net unrealized gain on available-for-sale debt securities, net of $0.3 million tax expense and $0.9 million tax expense in the third quarter of 2025 and 2024, respectively, and $0.8 million tax expense for the nine months ended 2025 and 2024, respectively.
(2)Reclassification adjustment for cash flow hedges, net of $0.1 million tax benefit and $0.1 million tax benefit in the third quarter of 2025 and 2024, respectively, and $0.2 million tax benefit and $0.1 million tax benefit for the nine months ended 2025 and 2024, respectively.
[2] Unrecognized pension and OPEB benefit, net of $4.6 million tax expense and $0.2 million tax expense in the third quarter of 2025 and 2024, respectively, and $4.8 million tax expense and $0.4 million tax expense for the nine months ended 2025 and 2024, respectively.