STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 5.4	$ 2.5	$ 39.6	$ (3.2)
Other comprehensive income (loss), net of tax - Note 8:
Defined benefit plans	0.8	1.0	(3.1)	2.8
Cash flow hedges	5.2	(1.4)	0.7	(20.8)
Other comprehensive income (loss), net of tax	6.0	(0.4)	(2.4)	(18.0)
Comprehensive income (loss)	$ 11.4	$ 2.1	$ 37.2	$ (21.2)