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

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.

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Amount of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

+ 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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