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Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Feb. 28, 2014
May. 31, 2015
May. 31, 2014
May. 31, 2013
May. 31, 2012
Income Tax And Non Income Tax Disclosure [Abstract]          
Unrecognized tax settlement $ 13.8        
Undistributed earnings of foreign subsidiaries indefinitely reinvested   $ 63.2      
Net deferred tax assets   87.5 $ 85.1    
Current deferred income taxes   81.0 81.0    
Noncurrent deferred income taxes   6.5 4.1    
Decrease in deferred tax valuation allowance   1.7 1.9    
Foreign operating loss carryforwards   109.1      
Unrecognized tax benefits   17.3 14.4 $ 35.5 $ 38.7
Income tax penalties and interest accrued   1.6 1.1 6.5  
Unrecognized tax benefits that would impact effective tax rate   14.6 11.7 21.8  
Tax (expense) benefit from income tax penalties and interest expense   (0.5) 5.3 $ (0.5)  
Period increase (decrease) in unrecognized tax benefits   $ (2.9) $ (21.1)