Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 134.0	$ 79.5	$ 157.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	14.2	(1.9)	(25.2)
Unrealized gain (loss) on derivatives	2.8	2.6	(0.8)
Employee pension and post-retirement benefits	(5.6)	0.4	2.2
Total other comprehensive income (loss), net of tax	11.4	1.1	(23.8)
Comprehensive income	$ 145.4	$ 80.6	$ 133.3