Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 18.2	$ 13.8	$ 32.8	$ (4.7)
Other comprehensive income (loss):
Foreign currency translation	(3.7)	4.1	(2.3)	4.8
Total comprehensive income	$ 14.5	$ 17.9	$ 30.5	$ 0.1