DIVESTITURES - Summary of Components of Income from Discontinued Operations, Net of Tax (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 2,035.6	$ 149.7	$ 174.3
Income (loss) from discontinued operations, net of tax attributable to noncontrolling interest	0.3	0.9	(0.2)
Income from discontinued operations, net of tax attributable to controlling interest	2,035.3	148.8	174.5
Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes	2,909.3	203.1	236.4
Income tax expense from discontinued operations	873.7	53.4	62.1
Income from discontinued operations, net of tax	2,035.6	149.7	174.3
Income (loss) from discontinued operations, net of tax attributable to noncontrolling interest	0.3	0.9	(0.2)
Income from discontinued operations, net of tax attributable to controlling interest	2,035.3	148.8	174.5
Discontinued Operations, Held-for-sale or Disposed of by Sale \| HHI Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes	136.9	253.3	288.2
Gain on sale of discontinued operations before income taxes	2,824.2	0.0	0.0
Discontinued Operations, Held-for-sale or Disposed of by Sale \| Other Disposal Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes	(2.4)	(3.8)	(7.3)
Discontinued Operations, Held-for-sale or Disposed of by Sale \| Corporate Debt
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before income taxes	$ 49.4	$ 46.4	$ 44.5

Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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