GOODWILL AND INTANGIBLE ASSETS - Schedule of Carrying Value and Accumulated Amortization for Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 741.6	$ 737.9
Accumulated Amortization	(480.1)	(456.2)
Net	261.5	281.7
Total Intangible Assets, Gross Carrying Amount	1,482.4	1,516.3
Total Intangible Assets, Net	1,002.3	1,060.1
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	740.8	778.4
Net	740.8	778.4
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	637.5	635.0
Accumulated Amortization	(431.9)	(412.9)
Net	205.6	222.1
Technology assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	75.3	75.3
Accumulated Amortization	(38.5)	(35.9)
Net	36.8	39.4
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28.8	27.6
Accumulated Amortization	(9.7)	(7.4)
Net	$ 19.1	$ 20.2