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GOODWILL AND INTANGIBLE ASSETS - Schedule of Changes in the Carrying Amount of Goodwill by Reporting Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill [Roll Forward]    
Balance at beginning of period $ 864.9 $ 854.7
Foreign currency impact 1.9 10.2
Balance at end of period 866.8 864.9
GPC    
Goodwill [Roll Forward]    
Balance at beginning of period 522.3 512.1
Foreign currency impact 1.9 10.2
Balance at end of period 524.2 522.3
H&G    
Goodwill [Roll Forward]    
Balance at beginning of period 342.6 342.6
Foreign currency impact 0.0 0.0
Balance at end of period $ 342.6 $ 342.6