Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 6.9	$ 16.3	$ 9.0	$ 22.0
Other comprehensive income, net of tax:
Defined benefit plan adjustments	0.1	0.1	0.1	0.2
Foreign currency translation (loss) gains, net	(2.2)	(0.1)	(1.6)	1.8
Other comprehensive (loss) income, net of tax	(2.1)	0.0	(1.5)	2.0
Comprehensive income	$ 4.8	$ 16.3	$ 7.5	$ 24.0