Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Nov. 30, 2020	Nov. 30, 2021	Nov. 30, 2020
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 20.8	$ 8.2	$ 32.3	$ (6.3)
Other comprehensive income, net of tax:
Currency translation adjustments	(3.9)	1.1	(4.5)	2.3
Pension and other post-retirement plans, net of tax of $0 and ($0.5) for the three months ended November 30, 2021 and 2020, respectively, and $0.1 and ($0.4) for the six months ended November 30, 2021 and 2020, respectively	0.3	(1.0)	0.6	(0.7)
Other comprehensive income (loss), net of tax	(3.6)	0.1	(3.9)	1.6
Comprehensive income (loss)	$ 17.2	$ 8.3	$ 28.4	$ (4.7)