Condensed Consolidated Statements of Comprehensive Income (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) earnings	$ (1.4)	$ 7.7
Other comprehensive income, net of tax:
Translation adjustments	2.2	0.7
Adjustment for net periodic pension and other postretirement benefits plan cost	0.4	0.5
Other comprehensive income, net of tax	2.6	1.2
Comprehensive (loss) income	$ 1.2	$ 8.9