STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2.5	$ (2.3)	$ (3.2)	$ (20.2)
Other comprehensive income (loss), net of tax
Defined benefit pension plans and Salaried VEBA	1.0	0.8	2.8	2.2
Cash flow hedges	(1.4)	10.0	(20.8)	33.7
Foreign currency translation				(0.1)
Other comprehensive (loss) income, net of tax	(0.4)	10.8	(18.0)	35.8
Comprehensive income (loss)	$ 2.1	$ 8.5	$ (21.2)	$ 15.6