CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 125.2	$ 117.5
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.4	0.2
Pension and other postretirement benefit costs, net of tax	0.1	0.3
Total Comprehensive Income	$ 125.7	$ 118.0