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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, 2020	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized loss on equity investments held	$ (7.5)	$ (12.1)	$ 0.0
Realized loss on equity investments sold	(9.3)	0.0	0.0
Loss on equity investments	(16.8)	(12.1)	$ 0.0
Dividend income from equity investments	5.0	4.8
Loss from equity investments	$ (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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