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FAIR VALUE MEASUREMENTS - Changes in Level 3 Convertible Debt Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | $ (53.2) | $ (24.8) | $ (96.4)
Net Unrealized Loss On Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | (40.4) | (34.9) | (102.0)
Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Total realized / unrealized gains (losses) included in net earnings | (64.2) | (97.6) |
Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments | Net Unrealized Loss On Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | 24.2 | 66.4 |
Fair value, inputs, level 3 | Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring | Convertible debt investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Fair value at beginning of year | 85.8 | 117.0 |
Fair value at end of year | $ 45.8 | $ 85.8 | $ 117.0

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