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FAIR VALUE MEASUREMENTS - Changes in Level 3 Convertible Debt Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | $ (24.8) | $ (96.4) | $ 35.1
Net Unrealized Loss On Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | (34.9) | (102.0) | (3.1)
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] |  |  |
Purchases | 0.0 | 25.0 |
Total realized / unrealized gains (losses) included in net earnings | (97.6) | 3.7 |
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 | 66.4 | (102.0) |
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 | 117.0 | 190.3 |
Fair value at end of year | $ 85.8 | $ 117.0 | $ 190.3

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