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Notes Payable and Long-Term Debt - Schedule of Primary Lines of Credit (Details) - Line of credit - Revolving credit facility - USD ($)
$ in Millions
Aug. 31, 2021
Aug. 31, 2020
Five-year revolving facilities    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity $ 2,750.0  
Long-term Line of Credit 0.0 $ 345.0
Bilateral, uncommitted revolving facilities [Member]    
Line of Credit Facility [Line Items]    
Short-term Debt, Fair Value $ 335.0 $ 0.0