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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Income (Loss) $ 588.8 $ (14.2) $ 383.1
Other comprehensive income (loss):      
Net unrealized gain (loss) on available-for-sale securities [1] (3.9) 2.7 5.7
Net unrealized gain (loss) on cash flow hedges [2] 25.4 (70.7) (64.2)
Unrecognized pension and OPEB benefit (costs) [3] 8.4 3.9 3.1
Total other comprehensive income (loss) 29.9 (64.1) (55.4)
Total Comprehensive Income (Loss) $ 618.7 $ (78.3) $ 327.7
[1] Net unrealized gain (loss) on available-for-sale securities, net of $1.0 million tax benefit, $0.7 million tax expense and $1.5 million tax expense in 2021, 2020 and 2019, respectively.
[2] Net unrealized gain (loss) on derivatives qualifying as cash flow hedges, net of $8.4 million tax expense, $23.4 million tax benefit and $21.2 million tax benefit in 2021, 2020 and 2019, respectively.
[3] Unrecognized pension and OPEB benefit, net of $3.8 million tax expense, $0.1 million tax benefit and $1.6 million tax expense in 2021, 2020 and 2019, respectively.