CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 54.8	$ 66.8	$ 180.0	$ 184.3
Other comprehensive income:
Reclassification adjustment transferred to Net income from cash flow hedges	0.0	0.3	0.4	0.5
Pension and other postretirement benefit costs, net of tax	0.6	0.3	0.7	0.6
Total Comprehensive Income	$ 55.4	$ 67.4	$ 181.1	$ 185.4