Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 145.9	$ (25.9)	$ 37.6
Other comprehensive income (loss), net of tax:
Translation adjustments	(0.7)	0.5	3.0
Adjustment for net periodic pension and other postretirement benefits plans	3.2	3.3	(4.9)
Other comprehensive income (loss), net of tax	2.5	3.8	(1.9)
Comprehensive income (loss)	$ 148.4	$ (22.1)	$ 35.7