CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 80.5	$ 67.6	$ 55.9
Other comprehensive income
Foreign currency translation adjustments	20.5	(5.7)	(21.9)
Pension and other post-retirement benefits adjustments, net of tax	(5.2)	(4.8)	(7.4)
Derivatives designated as hedges, net of tax	1.5	0.7	(0.8)
Other comprehensive income (loss)	16.8	(9.8)	(30.1)
Comprehensive income	$ 97.3	$ 57.8	$ 25.8