Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 12.9	$ 7.3
Other comprehensive income:
Change in foreign currency translation adjustment	2.0	1.2
Change in unrecognized net actuarial losses related to pension benefit plans, net of income tax expense of $0.2 and $0.2, respectively	0.1	0.2
Change in unrealized net gain on derivatives, net of income tax expense of $0.2 and $0.0, respectively	0.8	0.0
Total other comprehensive income	2.9	1.4
Comprehensive income	$ 15.8	$ 8.7