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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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