Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2019	Nov. 30, 2018
Condensed Consolidated Statements of Comprehensive Income
Net income	$ 14.2	$ 7.0	$ 18.6	$ 22.1
Other comprehensive income (loss), net of tax expense (benefit):
Currency translation adjustments	0.5	(0.6)	0.4	(1.1)
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 $0.0 for the three months ended November 30, 2019 and 2018, respectively, and $0.1 and $0.1 for the six months ended November 30, 2019 and 2018, respectively	0.3	0.2	0.5	0.5
Other comprehensive income (loss), net of tax	0.8	(0.4)	0.9	(0.6)
Comprehensive income	$ 15.0	$ 6.6	$ 19.5	$ 21.5