CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Comprehensive income:
Net income	$ 29.4	$ 31.0	$ 61.9	$ 77.6
Derivative instruments:
Reclassification of losses to net income, net of tax of $0	0.0	0.0	0.0	0.1
Other comprehensive income	0.0	0.0	0.0	0.1
Comprehensive income	$ 29.4	$ 31.0	$ 61.9	$ 77.7