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Investment and Other Income, net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Other Income and Expenses [Abstract] |  |  |  |
Net gains (losses) recognized on equity securities measured at fair value and trading debt securities | $ 56.3 | $ (6.9) | $ (3.6) | $ 76.0

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