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FAIR VALUE MEASUREMENTS - Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 01, 2023 | Apr. 02, 2022 | Apr. 01, 2023 | Apr. 02, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Total realized / unrealized gains (losses) included in OCI | $ (12.6) | $ 20.7 | $ (38.7) | $ 29.7
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 | (7.3) | 0.1 | (34.1) | 0.4
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 | 0.9 | 1.0 | 1.9 | 1.7
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 | (7.3) | 0.1 | (34.1) | 0.4
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 | 91.2 | 191.3 | 117.0 | 190.3
Fair value at end of period | $ 84.8 | $ 192.4 | $ 84.8 | $ 192.4

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