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Investment and Other Income (Losses), Net - Schedule of Investment and Other Income (Losses), Net (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Other Income and Expenses [Abstract]
Dividend and interest income	$ 141.4	$ 176.9	$ 159.9
Gains (losses) on investments, net	(37.6)	57.6	39.5
Income from investments in equity method investees	78.0	137.5	45.4
Gains (losses) on derivatives, net	(7.8)	(16.2)	(15.1)
Rental income	44.1	43.7	46.3
Foreign currency exchange losses, net	(11.6)	(19.9)	(26.7)
Other, net	6.3	15.9	13.0
Investment and Other Income, Net	$ 212.8	$ 395.5	$ 262.3

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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