Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 26.9	$ 11.4	$ 39.8	$ 18.7
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(5.2)	5.0	(3.2)	6.2
Change in unrecognized net actuarial losses related to pension benefit plans, net of income tax expense of $0.2, $0.3, $0.4 and $0.5, respectively	1.7	(0.1)	1.8	0.1
Change in unrealized net gain on derivatives, net of income tax expense of $0.1, $0.2, $0.3 and $0.2, respectively	0.2	0.2	1.0	0.2
Total other comprehensive (loss) income	(3.3)	5.1	(0.4)	6.5
Comprehensive income	$ 23.6	$ 16.5	$ 39.4	$ 25.2