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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net Income (Loss) $ 791.8 $ 588.8 $ (14.2)
Other comprehensive income (loss):      
Net unrealized gain (loss) on available-for-sale securities [1] (13.3) (3.9) 2.7
Net unrealized gain (loss) on cash flow hedges [2] 109.9 25.4 (70.7)
Unrecognized pension and OPEB benefit (costs) [3] (6.9) 8.4 3.9
Total other comprehensive income (loss) 89.7 29.9 (64.1)
Total Comprehensive Income (Loss) $ 881.5 $ 618.7 $ (78.3)
[1] Net unrealized gain (loss) on available-for-sale securities, net of $3.5 million tax benefit, $1.0 million tax benefit and $0.7 million tax expense in 2022, 2021 and 2020, respectively.
[2] Net unrealized gain (loss) on derivatives qualifying as cash flow hedges, net of $36.4 million tax expense, $8.4 million tax expense and $23.4 million tax benefit in 2022, 2021 and 2020, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $2.3 million tax benefit, $3.8 million tax expense and $0.1 million tax benefit in 2022, 2021 and 2020, respectively.