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Financial Instruments - Marketable Equity Securities (Details) - Marketable Equity Securities - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Debt and Equity Securities, FV-NI [Line Items] |  |
Current assets | $ 3.6 | $ 3.2
Other long-term assets | 43.9 | 40.6
Marketable equity securities | $ 47.5 | $ 43.8

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