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Separation costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Other Income and Expenses [Abstract] |  |  |  |
Separation costs | $ 0.2 | $ 4.7 | $ 0.5 | $ 11.1

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- Definition Separation Cost + References No definition available. + Details
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Namespace Prefix: | ngvt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration