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Weighted Average Common Shares (Tables)
3 Months Ended
Dec. 31, 2020
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]  
Schedule Of Basic And Diluted Earnings Per Share Reconciliation
Three Months Ended
December 31,
 2019 2020 
Basic shares outstanding610.0 598.5 
Dilutive shares4.1 3.4 
Diluted shares outstanding614.1 601.9