Earnings (Loss) per Share (Tables)

12 Months Ended

Dec. 31, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Years Ended December 31,
In millions (except share and per share data)	2021		2020		2019
Net income (loss) attributable to Ingevity stockholders	$	118.1	$	181.4	$	183.7
Basic and Diluted earnings (loss) per share (1)
Basic earnings (loss) per share	$	2.97	$	4.39	$	4.39
Diluted earnings (loss) per share	$	2.95	$	4.37	$	4.35
Shares (2)
Weighted average number of shares of common stock outstanding - Basic	39,816		41,330		41,801
Weighted average additional shares assuming conversion of potential common shares	243		217		399
Shares - diluted basis	40,059		41,547		42,200

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(1) Diluted earnings (loss) per share is calculated using net income (loss) available to common stockholders divided by diluted weighted average shares of common shares outstanding during each period, which includes the dilutive effect of outstanding equity awards.

(2) Shares are presented in thousands.

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following average number of potential common shares were antidilutive and, therefore, were not included in the diluted earnings per share calculation:

	Years Ended December 31,
In thousands	2021	2020	2019
Average number of potential common shares - antidilutive	98	177	66