Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 16.3	$ 13.2	$ 22.0	$ 18.7
Other comprehensive income (loss), net of tax:
Defined benefit plan adjustments	0.1	0.0	0.2	0.1
Foreign currency translation (loss) gain	(0.1)	0.5	1.8	(2.2)
Other comprehensive income (loss), net of tax	0.0	0.5	2.0	(2.1)
Comprehensive income	$ 16.3	$ 13.7	$ 24.0	$ 16.6