Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 14.6	$ 18.2	$ 24.3	$ 32.8
Other comprehensive income (loss):
Foreign currency translation	0.1	(3.7)	0.1	(2.3)
Total comprehensive income	$ 14.7	$ 14.5	$ 24.4	$ 30.5