RESTRUCTURING CHARGES - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 59.8	$ 40.3	$ 71.6
Tristar
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges	9.8
Russia dissolution
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges	2.0
Restructuring charges	0.6	0.0	0.0
GPC distribution center transition
Restructuring Cost and Reserve [Line Items]
Restructuring charges	30.4	11.5	0.0
Cumulative costs	41.9
Global productivity improvement program
Restructuring Cost and Reserve [Line Items]
Expected restructuring and related charges	157.3
Restructuring charges	$ 5.1	$ 21.2	$ 71.1