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Fair value measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring | There were no non-recurring fair value measurements in the Condensed Consolidated Balance Sheets as of June 30, 2017 or December 31, 2016.
In millions | Level 1(1) |  | Level 2(2) |  | Level 3(3) |  | Total
June 30, 2017 |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Equity investments (4) | $ | 2.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.2 |
Liabilities: |  |  |  |  |  |  |
Deferred compensation arrangement (5) | 1.5 |  |  | — |  |  | — |  |  | 1.5 |
Separation-related Reimbursement Awards (6) | 0.9 |  |  | — |  |  | — |  |  | 0.9 |
Total liabilities | $ | 2.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.4 |
December 31, 2016 |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |
Deferred compensation arrangement (5) | $ | 0.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.7 |
Separation-related Reimbursement Awards (6) | 2.1 |  |  | — |  |  | — |  |  | 2.1 |
Total liabilities | $ | 2.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.8 |
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(1) | Quoted prices in active markets for identical assets.
(2) | Quoted prices for similar assets and liabilities in active markets.
(3) | Significant unobservable inputs.
(4) | Included within "Prepaid and other current assets" on the Condensed Consolidated Balance Sheet.
(5) | Included within "Other liabilities" on the Condensed Consolidated Balance Sheet.
(6) | Included within "Accrued expenses" on the Condensed Consolidated Balance Sheet. This amount represents an amount due to WestRock associated with WestRock equity awards held by Ingevity employees post Separation. In accordance with the Employee Matters Agreement between Ingevity and WestRock entered into in connection with the Separation, we are required to reimburse WestRock the fair market value of awards on the day Ingevity employees exercise their awards. The expense recognized during the three and six months ended June 30, 2017 was $0.1 million and $0.3 million, respectively.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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