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Share-Based Payments - Options (Details) - Employee Stock Option - $ / shares
shares in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2021
Number of Options    
Balance at the beginning of the period (in shares) 0.3 0.4
Exercised (in shares) (0.2) (0.1)
Balance at the end of the period (in shares) 0.1 0.3
Stock options, Weighted average exercise price    
Balance at the beginning of the period (in dollars per share) $ 38.72 $ 36.41
Exercised (in dollars per share) 38.72 31.62
Balance at the end of the period (in dollars per share) $ 38.72 $ 38.72