DIVESTITURES - Schedule of Components of Income from Discontinued Operations, Net of Tax (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations, net of tax	$ 0.2	$ 25.5	$ 2,035.6
Income from discontinued operations attributable to noncontrolling interest, net of tax	0.0	0.0	0.3
Income from discontinued operations attributable to controlling interest, net of tax	0.2	25.5	2,035.3
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	4.5	25.1	2,909.3
Income tax expense (benefit) from discontinued operations	4.3	(0.4)	873.7
Income from discontinued operations, net of tax	0.2	25.5	2,035.6
Income from discontinued operations attributable to noncontrolling interest, net of tax	0.0	0.0	0.3
Income from discontinued operations attributable to controlling interest, net of tax	0.2	25.5	2,035.3
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	0.0	0.0	136.9
Gain on sale of HHI discontinued operations before income taxes	0.0	14.9	2,824.2
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	4.5	10.2	(2.4)
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	$ 0.0	$ 0.0	$ 49.4

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

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Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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