Condensed Consolidated Statementsof Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 9.5	$ 22.9
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments, net of tax of $0.1 and $0.1	(1.5)	0.2
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	(1.2)	0.4
Comprehensive income	$ 8.3	$ 23.3