CONSOLIDATED STATEMENTS OF COMPREHENSIVE EARNINGS (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 17.6	$ (19.5)	$ 30.1	$ (28.6)
Foreign currency translation	0.9	3.4	(2.7)	(4.1)
Employee benefit plans:
Amortization or settlement of actuarial losses and prior service costs	0.4	0.3	0.6	0.2
Net change in employee benefit plans	0.4	0.3	0.6	0.2
Changes in fair value of cash flow hedges:
Unrealized net gains (losses) arising during period	0.5	0.3	(0.3)	(0.9)
Net (gains) losses reclassified into earnings	(0.5)	0.3	(1.5)	0.4
Total cash flow hedges	0.0	0.6	(1.8)	(0.5)
Other comprehensive earnings (loss), net of tax	1.3	4.3	(3.9)	(4.4)
Comprehensive earnings (loss)	$ 18.9	$ (15.2)	$ 26.2	$ (33.0)