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Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2021
May 31, 2020
May 31, 2019
May 31, 2018
Loss Contingencies [Line Items]        
Deferred Tax Liabilities, Net $ 96.8 $ 92.3    
Deferred Tax Assets, Net 25.4 12.3    
Operating Loss Carryforwards, Valuation Allowance 3.8      
Decrease in deferred tax asset valuation allowance (8.2)      
Unrecognized tax benefits 12.3 10.2 $ 9.0 $ 10.1
Income tax penalties and interest accrued 2.6 2.2 1.4  
Unrecognized tax benefits that would impact effective tax rate 12.3 10.2 9.0  
Tax (expense) benefit from income tax penalties and interest expense 0.5 0.8 $ 0.4  
Period increase (decrease) in unrecognized tax benefits (2.1) (1.2)    
Gross unrecognized tax benefits that could reasonably change 1.9      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   (5.6)    
State and Local Jurisdiction        
Loss Contingencies [Line Items]        
Operating Loss Carryforwards, Valuation Allowance 10.8      
Non-United States        
Loss Contingencies [Line Items]        
Operating Loss Carryforwards, Valuation Allowance 25.1      
Other Noncurrent Liabilities        
Loss Contingencies [Line Items]        
Deferred Tax Liabilities, Net $ 0.0 6.3    
Deferred Tax Assets, Net   $ 18.6