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Separation costs (Tables)
 6 Months Ended
Jun. 30, 2017
Other Income and Expenses [Abstract]  
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.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In millions
2017
 
2016
 
2017
 
2016
Separation costs
$
0.2

 
$
4.7

 
$
0.5

 
$
11.1