Investment and Other Income, net - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2023 |
Mar. 31, 2022 |
Mar. 31, 2023 |
Mar. 31, 2022 |
|
Other Income and Expenses [Abstract] | ||||
Net gains (losses) recognized on equity securities measured at fair value and trading debt securities | $ 13.1 | $ (29.2) | $ 78.2 | $ (34.5) |