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Financial Instruments - Marketable Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Investments, All Other Investments [Abstract] |  |
Other current assets | $ 17.1 | $ 4.8
Other long-term assets | 42.1 | 42.5
Marketable equity securities | $ 59.2 | $ 47.3

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