CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Net income (loss)	$ (29.9)	$ (32.1)
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(5.6)	5.1
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	0.9	1.2
Total other comprehensive income (loss)	(4.8)	6.2
Comprehensive income (loss)	$ (34.7)	$ (25.9)