Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (14.5)	$ 4.4
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	1.2	(0.1)
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	0.2
Other comprehensive income (loss), net of tax	1.5	0.1
Comprehensive income (loss)	$ (13.0)	$ 4.5