Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Condensed Consolidated Statements of Comprehensive Income
Net income (loss)	$ 7.0	$ (22.6)	$ 22.1	$ (12.0)
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	(0.6)	1.9	(1.1)	2.5
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 $0.2 for the three months ended November 30, 2018 and 2017, respectively, and $0.1 and $0.3 for the six months ended November 30, 2018 and 2017, respectively	0.2	0.3	0.5	0.6
Other comprehensive income (loss), net of tax	(0.4)	2.2	(0.6)	3.1
Comprehensive income (loss)	$ 6.6	$ (20.4)	$ 21.5	$ (8.9)