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FINANCIAL INSTRUMENTS - Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments, All Other Investments [Abstract] |  |  |  |
Investment income, net | $ 3.1 | $ 6.0 | $ 10.4 | $ 19.8

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