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Common Stock and Related Matters - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]    
Treasury stock (in shares) 23,800,000 23,400,000
Treasury stock at original repurchase cost $ 2,532.5 $ 2,444.7
Reacquired shares of outstanding common stock (shares) 500,000  
Maximum number of shares that may yet be purchased under the program (shares) 3,800,000  
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]    
Preferred stock authorized (in shares) 50,000,000 50,000,000.0
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0