GOODWILL AND INTANGIBLE ASSETS - Schedule of Carrying Value and Accumulated Amortization for Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 744.1	$ 737.9
Accumulated Amortization	(470.8)	(456.2)
Net	273.3	281.7
Total Intangible Assets, Gross Carrying Amount	1,527.1	1,516.3
Total Intangible Assets, Net	1,056.3	1,060.1
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	783.0	778.4
Net	783.0	778.4
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	640.0	635.0
Accumulated Amortization	(425.0)	(412.9)
Net	215.0	222.1
Technology assets
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	75.3	75.3
Accumulated Amortization	(37.2)	(35.9)
Net	38.1	39.4
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	28.8	27.6
Accumulated Amortization	(8.6)	(7.4)
Net	$ 20.2	$ 20.2