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FAIR VALUE MEASUREMENTS - Changes in Level 3 Convertible Debt Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | $ (6.6) | $ (53.2) | $ (24.8)
Net Unrealized Loss On Securities |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Other comprehensive income (loss) before reclassifications | (3.5) | (40.4) | (34.9)
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 | (7.0) | (64.2) |
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 | (3.5) | 24.2 |
Exchange for non-voting exchangeable shares of FLUENT | (10.7) | 0.0 |
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 | 45.8 | 85.8 |
Fair value at end of year | $ 24.6 | $ 45.8 | $ 85.8

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