XML 14 R3.htm IDEA: XBRL DOCUMENT v3.25.1
Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net Income $ 526.7 $ 400.3
Other comprehensive income:    
Net unrealized loss on available-for-sale securities [1] 0.8 (0.3)
Net unrealized gain (loss) on cash flow hedges (0.1) (0.1)
Unrecognized pension and OPEB benefit (costs) [2] 0.5 0.2
Total other comprehensive income (loss) 1.2 (0.2)
Comprehensive Income $ 527.9 $ 400.1
[1] Net unrealized gain (loss) on available-for-sale debt securities, net of $0.2 million tax expense and $0.1 million tax benefit in the first quarter of 2025 and 2024, respectively.
[2] Unrecognized pension and OPEB benefit, net of $0.1 million of tax expense and $0.1 million tax expense in the first quarter of 2025 and 2024, respectively.