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Financial Instruments - Marketable Equity Securities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Investments, All Other Investments [Abstract] |  |
Other current assets | $ 4.8 | $ 3.2
Other long-term assets | 42.5 | 40.6
Marketable equity securities | $ 47.3 | $ 43.8

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