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FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of Income Recognized from Equity Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized loss on equity investments held		$ 0.0	$ (7.5)
Realized gain (loss) on equity investments sold		6.9	(9.3)
Gain (loss) on equity investments	$ 0.0	6.9	(16.8)
Dividend income from equity investments		0.2	5.0
Gain (loss) from equity investments		$ 7.1	$ (11.8)

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Amount of realized and unrealized gain (loss) on investment.

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This element represents the undistributed income (or loss) of equity method investments, net of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations; such investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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Amount of dividend income on nonoperating securities.

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