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EQUITY - Share-Based Awards, Additional Information (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Common share available for issue under share-based plan (in shares) 7.3    
Common shares were available to underlie the grant of new share-based award (in shares) 2.6    
Tax benefit realized from tax deduction associated with exercise of stock options and vesting of restricted share awards $ 18.3 $ 5.8 $ 2.8
Treasury Shares      
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Treasury shares reissued (in shares) 0.5 0.4 0.4
Share-Based Compensation Awards and Employee Stock Purchase Plan | Treasury Shares      
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Treasury shares reissued (in shares) 0.4 0.4 0.5
Performance-Based Units      
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Treasury shares reissued (in shares) 1.2    
Performance-Based Units | Weighted Average      
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Percentage of units granted 240.00%