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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Fair Value Disclosures [Abstract] |
Net unrealized gains included in earnings related to investments | $ 18.8

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- Definition Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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- References No definition available. + Details
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