CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Net income (loss)	$ (32.1)	$ (27.1)
Other comprehensive income (loss), net:
Foreign currency translation adjustments	5.1	0.5
Pension and post-retirement adjustments:
Amortization of prior service cost (credit)	(0.1)	(0.1)
Amortization of unrecognized gain (loss) included in net periodic cost	1.2	1.4
Total other comprehensive income (loss)	6.2	1.8
Comprehensive income (loss)	$ (25.9)	$ (25.3)