Common Shares (Details) - shares shares in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Basic shares outstanding (in shares)	570.8	583.6
Dilutive shares (in shares)	2.5	3.1
Diluted shares outstanding (in shares)	573.3	586.7