Earnings (Loss) per Share - Schedule of Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share Reconciliation
Net income (loss) attributable to Ingevity stockholders	$ 118.1	$ 181.4	$ 183.7
Basic and Diluted earnings (loss) per share
Basic earnings (loss) per share (usd per share)	$ 2.97	$ 4.39	$ 4.39
Diluted earnings (loss) per share (usd per share)	$ 2.95	$ 4.37	$ 4.35
Shares
Weighted average number of common shares outstanding - Basic (shares)	39,816	41,330	41,801
Weighted average additional shares assuming conversion of potential common shares (shares)	243	217	399
Shares - diluted basis (shares)	40,059	41,547	42,200