CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Net income (loss)	$ (20.1)	$ (10.3)	$ 9.6	$ 45.4
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(5.2)	3.7	1.9	(2.2)
Pension and post-retirement adjustments:
Amortization of prior service credit	(0.1)	(0.2)	(0.3)	(0.5)
Amortization of unrecognized gains and losses included in net periodic cost	0.8	1.1	3.9	4.2
Total other comprehensive income (loss)	(4.5)	4.6	5.5	1.5
Comprehensive income (loss)	$ (24.6)	$ (5.7)	$ 15.1	$ 46.9