Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 13.7	$ 4.8	$ 35.3	$ 35.7
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	(0.2)	(1.8)	(2.8)	(0.8)
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 $0.1 for the three months ended February 28, 2017 and February 29, 2016, respectively, and $0.5 and $0.4 for the nine months ended February 28, 2017 and February 29, 2016, respectively	0.3	0.3	0.8	0.8
Other comprehensive income (loss), net of tax	0.1	(1.5)	(2.0)
Comprehensive income	$ 13.8	$ 3.3	$ 33.3	$ 35.7