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SHAREHOLDER’S EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
May 23, 2024
May 20, 2024
Nov. 16, 2023
Jun. 20, 2023
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Jun. 17, 2023
Accelerated Share Repurchases [Line Items]                
Authorized share repurchase amount   $ 500.0           $ 1,000.0
Treasury stock repurchases $ 50.0 $ 50.0            
Common stock, par value (in dollars per share)         $ 0.01 $ 0.01    
Payments for repurchase of common stock         $ 482.7 $ 34.7 $ 134.0  
Number of shares repurchased (in shares)         7.4 5.7 1.4  
Treasury Stock                
Accelerated Share Repurchases [Line Items]                
Treasury stock repurchases         $ 565.9 $ 434.7 $ 134.0  
ASR                
Accelerated Share Repurchases [Line Items]                
Treasury stock repurchases         $ 0.0 $ 500.0    
Accelerated share repurchase amount       $ 500.0        
Common stock, par value (in dollars per share)       $ 0.01        
Payments for repurchase of common stock       $ 500.0        
Number of shares repurchased (in shares)     1.3 5.3 1.3 5.3 0.0  
Treasury stock, acquired, percentage       80.00%        
Value of repurchased common stock from related parties         $ 83.2      
ASR | Treasury Stock                
Accelerated Share Repurchases [Line Items]                
Treasury stock repurchases       $ 400.0 83.2 $ 400.0 $ 0.0  
ASR | Additional Paid-in Capital                
Accelerated Share Repurchases [Line Items]                
Treasury stock repurchases       $ (100.0) $ (83.2) $ 100.0