CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (INCOME) LOSS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 30.5	$ (2.1)	$ (147.0)	$ 75.3
Unrealized gain on interest rate derivative instrument	6.0		5.4
Comprehensive income (loss)	$ 36.5	$ (2.1)	$ (141.6)	$ 75.3