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Commitments and Contingencies, legal accruals and unasserted claims (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Loss Contingency, Estimate
Accrual for legal proceedings and unasserted claims	$ 0.5	$ 0.4

X

- 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=25496072&loc=d3e14326-108349

+ Details

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Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration