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Statements of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net Income (Loss) $ (14.2) $ 383.1 $ (50.6)
Other comprehensive income (loss):      
Net unrealized gain (loss) on available-for-sale securities [1] 2.7 5.7 (2.6)
Net unrealized gain (loss) on cash flow hedges [2] (70.7) (64.2) 22.7
Unrecognized pension and OPEB benefit (costs) [3] 3.9 3.1 (4.4)
Total other comprehensive income (loss) (64.1) (55.4) 15.7
Total Comprehensive Income (Loss) $ (78.3) $ 327.7 $ (34.9)
[1] Net unrealized gain (loss) on available-for-sale securities, net of $0.7 million tax expense, $1.5 million tax expense and $0.6 million tax benefit in 2020, 2019 and 2018, respectively.
[2] Net unrealized gain (loss) on derivatives qualifying as cash flow hedges, net of $23.4 million tax benefit, $21.2 million tax benefit and $7.5 million tax expense in 2020, 2019 and 2018, respectively.
[3] Unrecognized pension and OPEB benefit (costs), net of $0.1 million tax benefit, $1.6 million tax expense and $1.5 million tax benefit in 2020, 2019 and 2018, respectively.