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Acquisitions (Business Acquisition, Pro Forma Information) (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
Business Combinations [Abstract]  
Net sales $ 647.3
Income (loss) before income taxes $ 127.0
Diluted earnings (loss) per share attributable to Ingevity stockholders (usd per share) | $ / shares $ 2.49