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Investment and Other Income , Net - Schedule of Investment and Other Income, Net (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Other Income and Expenses [Abstract] |  |
Dividend and interest income | $ 43.1 | $ 54.8
Gains (losses) on investments, net | (57.1) | 60.1
Income (losses) from investments in equity method investees | (7.6) | 56.9
Gains (losses) on derivatives, net | 6.6 | (8.2)
Rental income | 11.2 | 10.8
Foreign currency exchange gains (losses), net | 14.5 | (7.4)
Other, net |  | 6.2
Other, net | (0.2) |
Investment and other income, net | $ 10.5 | $ 173.2

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