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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Debt and Equity Securities, FV-NI [Line Items] |  |
Other current assets | $ 6.6 | $ 4.8
Other long-term assets | 82.6 | 68.5
Marketable equity securities | $ 89.2 | $ 73.3

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