Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 11.5	$ (14.5)
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	(0.6)	1.2
Pension and other post-retirement plans:
Amortization of actuarial loss and prior service cost included in net income, net of tax of $0.1 and $0.1	0.3	0.3
Other comprehensive income (loss), net of tax	(0.3)	1.5
Comprehensive income (loss)	$ 11.2	$ (13.0)