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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Millions
12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 294.6 $ 44.4 $ 31.1
Other comprehensive income (loss), net:      
Foreign currency translation adjustments (15.3) (3.1) (2.6)
Pension and post-retirement adjustments:      
Amortization of prior service credit (0.2) (0.2) (0.4)
Amortization of unrecognized gains and (losses) included in net periodic cost (6.3) 13.5 11.8
Total other comprehensive income (loss) (21.8) 10.2 8.8
Comprehensive income (loss) $ 272.8 $ 54.6 $ 39.9