Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2017	Aug. 31, 2016
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 10.6	$ 9.5
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments, net of tax of $0 and $0.1	0.6	(1.5)
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	0.9	(1.2)
Comprehensive income	$ 11.5	$ 8.3