CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Net income (loss)	$ (34.1)	$ (29.9)
Other comprehensive income (loss), net:
Foreign currency translation adjustments	0.5	(5.6)
Pension and post-retirement adjustments:
Amortization of prior service cost (credit)	0	(0.1)
Amortization of unrecognized gain (loss) included in net periodic cost	0.5	0.9
Total other comprehensive income (loss)	1.0	(4.8)
Comprehensive income (loss)	$ (33.1)	$ (34.7)