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Contingencies - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2017	Jan. 01, 2017
Commitments and Contingencies Disclosure [Abstract]
Accrual for litigation costs	$ 5.3	$ 9.2

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- References

No definition available.

+ Details

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

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