Commitments and Contingencies	9 Months Ended
Sep. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings On July 19, 2018, we filed suit against BASF Corporation ("BASF") in the United States District Court for the District of Delaware (the "Delaware Proceeding") alleging BASF infringed Ingevity's patent covering canister systems used in the control of automotive gasoline vapor emissions (U.S. Patent No. RE38,844) (the "844 Patent"). On February 14, 2019, BASF asserted counterclaims against us in the Delaware Proceeding, alleging two claims for violations of U.S. antitrust law (one for exclusive dealing and the other for tying) as well as a claim for tortious interference with an alleged prospective business relationship between BASF and a BASF customer (the "BASF Counterclaims"). The BASF Counterclaims relate to our enforcement of the 844 Patent and our entry into several supply agreements with customers of its fuel vapor canister honeycombs. The U.S. District Court dismissed our patent infringement claims on November 18, 2020, and the case proceeded to trial on the BASF Counterclaims in September 2021. On September 15, 2021, a jury in the Delaware Proceeding issued a verdict in favor of BASF on the BASF Counterclaims and awarded BASF damages of approximately $28.3 million, which trebled under U.S. antitrust law to approximately $85.0 million. On May 18, 2023, the court in the Delaware Proceeding entered judgment on the jury's verdict, which commenced the post-trial briefing stage. On February 13, 2024, the court in the Delaware Proceeding denied BASF's motion for pre-judgment interest on its tortious interference claim as well as our motion seeking judgment as a matter of law, or a new trial in the alternative. On March 13, 2024, we appealed the verdict as well as the U.S. District Court's November 2020 dismissal of our patent infringement claims against BASF to the U.S. Federal Circuit Court of Appeals. On February 11, 2026, the U.S. Federal Circuit Court of Appeals ruled against Ingevity on our appeal and we decided to no longer pursue any further appeals. On March 13, 2026, we entered into an agreement with BASF, providing for the payment of: (1) the judgment, plus post-judgment interest, in the amount of $97.0 million and (2) $16.2 million to resolve BASF's claim for attorneys' fees and costs, and made such payments on April 1, 2026. The Delaware Proceeding, including all appeals and counterclaims, is now complete. The $16.2 million charge taken during the first quarter of 2026 was included within "Other (income) expense, net" on the condensed consolidated statements of operations for the nine months ended September 30, 2026.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2026

Commitments and Contingencies Disclosure [Abstract]

Legal Proceedings

On July 19, 2018, we filed suit against BASF Corporation ("BASF") in the United States District Court for the District of Delaware (the "Delaware Proceeding") alleging BASF infringed Ingevity's patent covering canister systems used in the control of automotive gasoline vapor emissions (U.S. Patent No. RE38,844) (the "844 Patent"). On February 14, 2019, BASF asserted counterclaims against us in the Delaware Proceeding, alleging two claims for violations of U.S. antitrust law (one for exclusive dealing and the other for tying) as well as a claim for tortious interference with an alleged prospective business relationship between BASF and a BASF customer (the "BASF Counterclaims"). The BASF Counterclaims relate to our enforcement of the 844 Patent and our entry into several supply agreements with customers of its fuel vapor canister honeycombs. The U.S. District Court dismissed our patent infringement claims on November 18, 2020, and the case proceeded to trial on the BASF Counterclaims in September 2021.

On September 15, 2021, a jury in the Delaware Proceeding issued a verdict in favor of BASF on the BASF Counterclaims and awarded BASF damages of approximately $28.3 million, which trebled under U.S. antitrust law to approximately $85.0 million. On May 18, 2023, the court in the Delaware Proceeding entered judgment on the jury's verdict, which commenced the post-trial briefing stage. On February 13, 2024, the court in the Delaware Proceeding denied BASF's motion for pre-judgment interest on its tortious interference claim as well as our motion seeking judgment as a matter of law, or a new trial in the alternative.

On March 13, 2024, we appealed the verdict as well as the U.S. District Court's November 2020 dismissal of our patent infringement claims against BASF to the U.S. Federal Circuit Court of Appeals. On February 11, 2026, the U.S. Federal Circuit Court of Appeals ruled against Ingevity on our appeal and we decided to no longer pursue any further appeals. On March 13, 2026, we entered into an agreement with BASF, providing for the payment of: (1) the judgment, plus post-judgment interest, in the amount of $97.0 million and (2) $16.2 million to resolve BASF's claim for attorneys' fees and costs, and made such payments on April 1, 2026. The Delaware Proceeding, including all appeals and counterclaims, is now complete. The $16.2 million charge taken during the first quarter of 2026 was included within "Other (income) expense, net" on the condensed consolidated statements of operations for the nine months ended September 30, 2026.