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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($) $ in Millions | Jun. 29, 2019 | Dec. 31, 2018
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Debt and Equity Securities, FV-NI [Line Items] |  |
Current assets | $ 15.7 | $ 4.8
Other long-term assets | 38.2 | 42.5
Marketable equity securities | $ 53.9 | $ 47.3

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