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SHARE BASED COMPENSATION - Summary of RSU Activity (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Shares      
Beginning balance (in shares) 1.4 1.2 0.6
Granted (in shares) 0.6 0.9 1.5
Forfeited (in shares) (0.2) (0.1) (0.7)
Vested (in shares) (0.3) (0.6) (0.2)
Ending balance (in shares) 1.5 1.4 1.2
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 56.41 $ 53.58 $ 107.71
Granted (in dollars per share) 76.78 61.72 53.11
Forfeited (in dollars per share) 65.52 60.79 92.76
Vested (in dollars per share) 53.53 57.80 83.47
Ending balance (in dollars per share) $ 64.00 $ 56.41 $ 53.58
Fair Value at Grant Date      
Beginning balance $ 79.3 $ 67.0 $ 69.0
Granted 44.9 55.6 81.4
Forfeited (13.2) (4.0) (63.7)
Vested (17.8) (39.3) (19.7)
Ending balance $ 93.2 $ 79.3 $ 67.0
SB/RH      
Shares      
Beginning balance (in shares) 1.4 1.2 0.6
Granted (in shares) 0.6 0.9 1.5
Forfeited (in shares) (0.2) (0.1) (0.7)
Vested (in shares) (0.3) (0.6) (0.2)
Ending balance (in shares) 1.5 1.4 1.2
Weighted Average Grant Date Fair Value      
Beginning balance (in dollars per share) $ 56.33 $ 53.22 $ 108.75
Granted (in dollars per share) 76.83 61.68 52.82
Forfeited (in dollars per share) 65.52 60.79 93.05
Vested (in dollars per share) 52.82 57.29 82.37
Ending balance (in dollars per share) $ 63.85 $ 56.33 $ 53.22
Fair Value at Grant Date      
Beginning balance $ 77.7 $ 65.0 $ 67.2
Granted 43.3 54.3 79.8
Forfeited (13.2) (3.9) (63.5)
Vested (16.2) (37.7) (18.5)
Ending balance $ 91.6 $ 77.7 $ 65.0