Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 15.1	$ 10.6
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	(0.5)	0.6
Pension and other post-retirement plans:
Amortization of actuarial loss and prior service cost included in net income, net of tax of $0.1 and $0.1	0.3	0.3
Total other comprehensive income (loss), net of tax	(0.2)	0.9
Comprehensive income	$ 14.9	$ 11.5