Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ 2.3	$ (37.4)	$ 20.9	$ (15.3)
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	(0.1)	0.5	0.3	(0.6)
Pension and other post-retirement plans:
Amortization of actuarial loss and prior service cost included in net income, net of tax of $0.0 and $0.1 for the three months ended February 29/28, 2020 and 2019, respectively, and $0.1 and $0.2 for the nine months ended February 29/28, 2020 and 2019, respectively	0.2	0.3	0.7	0.8
Other comprehensive income, net of tax	0.1	0.8	1.0	0.2
Comprehensive income (loss)	$ 2.4	$ (36.6)	$ 21.9	$ (15.1)