STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 3.1	$ 18.3	$ 27.7	$ 34.2
Other comprehensive (loss) income, net of tax - Note 8:
Defined benefit plans	(0.1)	(4.6)	(0.6)	(3.9)
Cash flow hedges	3.3	(2.7)	1.7	(4.5)
Other comprehensive income (loss), net of tax	3.2	(7.3)	1.1	(8.4)
Comprehensive income	$ 6.3	$ 11.0	$ 28.8	$ 25.8