Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income	$ 15.5	$ 13.7	$ 3.6	$ 35.3
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	0.9	(0.2)	3.4	(2.8)
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 $0.2 for the three months ended February 28, 2018 and 2017, respectively, and $0.4 and $0.5 for the nine months ended February 28, 2018 and 2017, respectively	0.3	0.3	0.9	0.8
Other comprehensive income (loss), net of tax	1.2	0.1	4.3	(2.0)
Comprehensive income	$ 16.7	$ 13.8	$ 7.9	$ 33.3