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Weighted Average Common Shares
6 Months Ended
Mar. 31, 2020
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]  
Weighted Average Common Shares WEIGHTED-AVERAGE COMMON SHARES
Reconciliations of weighted-average shares for basic and diluted earnings per common share follow. Earnings allocated to participating securities were inconsequential.
Three Months Ended
March 31,
Six Months Ended
March 31,
 2019  2020  2019  2020  
Basic shares outstanding614.0  607.4  619.0  608.7  
Dilutive shares4.1  3.6  3.9  3.9  
Diluted shares outstanding618.1  611.0  622.9  612.6