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Assets - Goodwill (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) D | Oct. 01, 2018 USD ($)
Goodwill |  |
Changes in goodwill during the period | $ 0.0 |
Number of trading days used in adjusted market capitalization calculation | D | 10 |
Amount of fair value of reporting unit in excess of carrying amount |  | $ 60.0

X
- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Number of trading days prior to measurement date for determining average closing share priced used in adjusted market capitalization calculation. + References No definition available. + Details
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