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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net Income $ 844.7 $ 674.4 $ 791.8
Other comprehensive income:      
Net unrealized gain (loss) on available-for-sale securities [1] 3.3 3.9 (13.3)
Net unrealized gain (loss) on cash flow hedges [2] (0.4) (0.2) 109.9
Unrecognized pension and OPEB benefit (costs) [3] 0.3 (0.2) (6.9)
Total other comprehensive income 3.2 3.5 89.7
Total Comprehensive Income $ 847.9 $ 677.9 $ 881.5
[1] Net unrealized gain (loss) on available-for-sale securities, net of $0.9 million tax expense, $1.0 million tax expense and $3.5 million tax benefit in 2024, 2023 and 2022, respectively.
[2] Net unrealized (loss) gain on derivatives qualifying as cash flow hedges, net of $0.1 million tax benefit, $0.1 million tax benefit and $36.4 million tax expense in 2024, 2023 and 2022, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.3 million tax expense, $0.1 million tax benefit and $2.3 million tax benefit in 2024, 2023 and 2022, respectively.