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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Jun. 01, 2018
May 31, 2021
May 31, 2020
Jun. 01, 2019
May 31, 2018
New accounting pronouncements adopted          
Revenue, practical expedient application of ASC 606 true        
Operating lease ROU assets   $ 75.8 $ 89.7    
Operating lease liabilities   59.9 70.9    
Other liabilities   29.5 34.4    
Retained earnings   $ 741.7 $ 706.0    
ASC 606 | ASC 606 Adjustments          
New accounting pronouncements adopted          
Retained earnings         $ (20.4)
Cumulative effect adjustment | ASC 842          
New accounting pronouncements adopted          
Retained earnings       $ 2.5  
Cumulative effect adjustment | ASC 842 | Right of use including discontinued operations          
New accounting pronouncements adopted          
Operating lease ROU assets       123.2  
Operating lease liabilities       116.8  
Cumulative effect adjustment | ASC 842 | Held for sale or Disposed          
New accounting pronouncements adopted          
Operating lease ROU assets       26.6  
Operating lease liabilities       $ 25.3