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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ (39.6) $ (49.4)
Other comprehensive income (loss), net:    
Foreign currency translation adjustments (1.9) (7.3)
Pension and post-retirement adjustments (net of tax) 0.7 0.7
Total other comprehensive income (loss) (1.2) (6.6)
Comprehensive income (loss) $ (40.8) $ (56.0)