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Taxes (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Feb. 29, 2016
May 31, 2017
May 31, 2016
May 31, 2015
Feb. 28, 2017
May 31, 2014
Income Tax And Non Income Tax Disclosure [Abstract]            
Settlements during the period $ 4.9 $ 0.6 $ 2.9 $ 0.0    
Undistributed earnings of foreign subsidiaries indefinitely reinvested   63.2        
Net deferred tax assets   53.7 68.5      
Decrease in deferred tax asset valuation allowance   1.6        
Increase in deferred tax asset valuation allowance     0.1      
Foreign operating loss carryforwards   112.3        
Unrecognized tax benefits   14.1 17.9 17.3   $ 14.4
Income tax penalties and interest accrued   1.7 2.3 1.6    
Unrecognized tax benefits that would impact effective tax rate   14.1 17.0 14.6    
Tax (expense) benefit from income tax penalties and interest expense   0.6 (0.7) $ (0.5)    
Period increase (decrease) in unrecognized tax benefits   $ (3.8) $ (0.6)      
State Sales Tax Assessment [Member] | Wisconsin [Member]            
Loss Contingencies [Line Items]            
Sales and Excise Tax Payable         $ 5.4