Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 13.5	$ 15.1	$ 35.5	$ 33.8
Other comprehensive income (loss), net of tax:
Defined benefit plan adjustments	0.3	(0.8)	0.5	(0.7)
Foreign currency translation (loss) gain	(0.2)	(1.9)	1.6	(4.1)
Other comprehensive income (loss), net of tax	0.1	(2.7)	2.1	(4.8)
Comprehensive income	$ 13.6	$ 12.4	$ 37.6	$ 29.0