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FAIR VALUE MEASUREMENTS - Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Purchases | $ 25.0 | $ 193.1 |
Total realized / unrealized losses included in OCI | (96.4) | 35.1 | $ (22.1)
Net Unrealized Loss On Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Total realized / unrealized losses included in OCI | (102.0) | (3.1) | 0.0
Convertible debt investments |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Total realized / unrealized gains included in net earnings | 3.7 | 0.3 |
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 | 190.3 | 0.0 |
Fair value at end of year | $ 117.0 | $ 190.3 | $ 0.0

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