CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (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	$ 50.3	$ 55.5	$ 230.3	$ 239.8
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.0	0.1	0.4	0.6
Pension and other postretirement benefit costs, net of tax	0.7	0.4	1.4	1.0
Total Comprehensive Income	$ 51.0	$ 56.0	$ 232.1	$ 241.4