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Debt Including Capital Lease Obligations - Narrative (Details) $ in Millions	Jun. 30, 2017 USD ($)
Line of Credit
Line of Credit Facility
Letters of credit outstanding, amount	$ 1.8
Letter of credit remaining amount	$ 297.0
Senior Notes | Minimum
Line of Credit Facility
Leverage ratio	3.00
Senior Notes | Maximum
Line of Credit Facility
Leverage ratio	3.75

X

- Definition

Debt Instrument, Covenant Compliance, Leverage Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	ngvt_
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Balance Type:	na
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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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.

+ Details

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X

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Details

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X

- Details

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Period Type:

X

- Details

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