GOODWILL AND INTANGIBLE ASSETS - Changes in the Carrying Amount of Goodwill by Reporting Segment (Details) $ in Millions	6 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Goodwill at beginning of period	$ 854.7
Foreign currency impact	3.6
Goodwill at end of period	858.3
GPC
Goodwill [Roll Forward]
Goodwill at beginning of period	512.1
Foreign currency impact	3.6
Goodwill at end of period	515.7
H&G
Goodwill [Roll Forward]
Goodwill at beginning of period	342.6
Foreign currency impact	0.0
Goodwill at end of period	$ 342.6