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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 64.9 $ 68.5 $ 15.5 $ 34.4
Other comprehensive income (loss), net:        
Foreign currency translation adjustments (0.9) (8.0) (8.2) (7.5)
Pension and post-retirement adjustments (net of tax) 0.8 (2.0) 1.5 (1.5)
Total other comprehensive income (loss) (0.1) (10.0) (6.7) (9.0)
Comprehensive income (loss) $ 64.8 $ 58.5 $ 8.8 $ 25.4