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Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2014
Feb. 29, 2016
May 31, 2016
May 31, 2015
May 31, 2014
May 31, 2013
Income Tax And Non Income Tax Disclosure [Abstract]            
Settlements during the period   $ 4.9 $ 2.9 $ 0.0 $ 1.8  
Unrecognized tax settlement $ 13.8          
Undistributed earnings of foreign subsidiaries indefinitely reinvested     63.2      
Net deferred tax assets     68.5 87.5    
Noncurrent deferred income taxes       6.5    
Current deferred income taxes       81.0    
Decrease in deferred tax valuation allowance     0.1 1.7    
Foreign operating loss carryforwards     115.5      
Unrecognized tax benefits     17.9 17.3 14.4 $ 35.5
Income tax penalties and interest accrued     2.3 1.6 1.1  
Unrecognized tax benefits that would impact effective tax rate     17.0 14.6 11.7  
Tax (expense) benefit from income tax penalties and interest expense     (0.7) (0.5) $ 5.3  
Period increase (decrease) in unrecognized tax benefits     $ (0.6) $ (2.9)