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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($) $ in Millions | Oct. 02, 2021 | Dec. 31, 2020
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Debt and Equity Securities, FV-NI [Line Items] |  |
Current assets | $ 2.7 | $ 9.3
Other long-term assets | 55.1 | 49.4
Marketable equity securities | $ 57.8 | $ 58.7

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