STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 12.0	$ 5.4	$ 39.7	$ 39.6
Other comprehensive income (loss), net of tax - Note 8:
Defined benefit plans	0.5	0.8	(0.1)	(3.1)
Cash flow hedges	1.6	5.2	3.3	0.7
Other comprehensive income (loss), net of tax	2.1	6.0	3.2	(2.4)
Comprehensive income	$ 14.1	$ 11.4	$ 42.9	$ 37.2