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Financial Instruments - Marketable Equity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value Disclosures [Abstract] |  |
Current assets | $ 0.0 | $ 3.2
Other long-term assets | 45.6 | 40.6
Marketable equity securities | $ 45.6 | $ 43.8

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- Definition For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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