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Financial Instruments - Marketable Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Investments, All Other Investments [Abstract] |  |
Other current assets | $ 9.3 | $ 17.1
Other long-term assets | 49.4 | 42.1
Marketable equity securities | $ 58.7 | $ 59.2

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