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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($) $ in Millions | Jul. 04, 2020 | Dec. 31, 2019
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Debt and Equity Securities, FV-NI [Line Items] |  |
Current assets | $ 7.6 | $ 17.1
Other long-term assets | 39.7 | 42.1
Marketable equity securities | $ 47.3 | $ 59.2

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