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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, 2021	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized loss on equity investments held	$ 0.0	$ (7.5)	$ (12.1)
Realized gain (loss) on equity investments sold	6.9	(9.3)	0.0
Gain (loss) on equity investments	6.9	(16.8)	(12.1)
Dividend income from equity investments	0.2	5.0	4.8
Gain (loss) from equity investments	$ 7.1	$ (11.8)	$ (7.3)

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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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