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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Net Income $ 431.3 $ 296.5
Other comprehensive income:    
Net unrealized loss on available-for-sale securities [1] (5.7) (2.5)
Net unrealized gain (loss) on cash flow hedges [2] 47.0 84.6
Unrecognized pension and OPEB benefit (costs) [3] 0.1 (0.9)
Total other comprehensive income 41.4 81.2
Comprehensive Income $ 472.7 $ 377.7
[1] Net unrealized loss on available-for-sale debt securities, net of $1.5 million and $0.7 million tax benefit in the first quarter of 2022 and 2021, respectively.
[2] Net unrealized gain on cash flow hedges, net of $21.3 million and $28.0 million tax expense in the first quarter of 2022 and 2021, respectively.
[3] Unrecognized pension and OPEB benefit, net of zero and $0.9 million tax expense in the first quarter of 2022 and 2021, respectively.