Business separation

12 Months Ended

Dec. 31, 2017

Other Income and Expenses [Abstract]

Business separation

Business separation

In connection with the Separation as further described in Note 1 and Note 2, we have incurred pre-tax separation costs as shown in the table below. Prior to the Separation, these costs were primarily related to third-party professional fees associated with separation activities and one-time costs of new hires specifically required to separate and stand up Ingevity. Post-Separation, these costs represent legal, information technology and other advisory fees to transition from a division of WestRock to a stand-alone public company.

	Years Ended December 31,
In millions	2017		2016		2015
Separation costs	$	0.9	$	17.5	$	17.2