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Basis of Presentation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2020
Nov. 30, 2020
May 31, 2020
Long Lived Assets Held-for-sale [Line Items]      
Assets held-for-sale   $ 3.3  
Land, Buildings and Improvements      
Long Lived Assets Held-for-sale [Line Items]      
Long-lived assets     $ 5.7
Proceeds from sale $ 12.3    
Gain on sale $ 6.6