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FAIR VALUE MEASUREMENTS - Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 29, 2024 | Jul. 01, 2023 | Jun. 29, 2024 | Jul. 01, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total realized / unrealized gains (losses) included in OCI | $ 5.4 | $ 13.0 | $ 1.6 | $ (25.8)
Net Unrealized Gain (Loss) On Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total realized / unrealized gains (losses) included in OCI | 5.1 | 0.6 | 3.6 | (33.5)
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 included in net earnings | 0.1 | 1.1 | 0.3 | 3.0
Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments | Net Unrealized Gain (Loss) On Securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total realized / unrealized gains (losses) included in OCI | 5.1 | 0.6 | 3.6 | (33.5)
Fair value, inputs, level 3 | Estimated Fair Value | 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 period | 84.5 | 84.8 | 85.8 | 117.0
Fair value at end of period | $ 89.7 | $ 86.5 | $ 89.7 | $ 86.5

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