CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 40.4	$ (32.6)	$ (99.8)
Other comprehensive loss:
Foreign currency translation income (loss)	8.2	(4.9)	(6.9)
Total comprehensive income (loss)	$ 48.6	$ (37.5)	$ (106.7)