Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (22.6)	$ 12.1	$ (12.0)	$ 21.6
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	1.9	(1.1)	2.5	(2.6)
Pension and other post-retirement plans:
Amortization of actuarial loss and prior service cost included in net income, net of tax of $0.2 and $0.2 for the three months ended November 30, 2017 and 2016, respectively, and $0.3 and $0.3 for the six months ended November 30, 2017 and 2016, respectively	0.3	0.2	0.6	0.5
Other comprehensive income (loss), net of tax	2.2	(0.9)	3.1	(2.1)
Comprehensive income (loss)	$ (20.4)	$ 11.2	$ (8.9)	$ 19.5