CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 119.0	$ 125.2
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.0	0.4
Pension and other postretirement benefit costs, net of tax	0.6	0.1
Total Comprehensive Income	$ 119.6	$ 125.7