Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
Condensed Consolidated Statements of Comprehensive Income
Currency translation adjustments, tax	$ 0.2	$ 0.1	$ 0.8	$ 0.1
Unrealized gain (loss) arising during period, tax	0	0	0.2	0
Amortization of actuarial loss and prior service cost included in net income, tax	$ 0.2	$ 0	$ 0.5	$ 0