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New Accounting Standards ASU 2016-09 (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Description	no material impact
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect from Adoption of new accounting for stock-based compensation	$ 1.3	$ 1.3

X

- Definition

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

+ References

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- Definition

Disclosure related to a new accounting pronouncement or a change in accounting principle, including the nature and reason for the change and the effect of the change on prior periods and the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01(b)(6))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Section 50
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-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 11.M)
-URI http://asc.fasb.org/extlink&oid=26874127&loc=d3e31137-122693

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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