Goodwill and other intangible assets, net (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The changes in the carrying amount of goodwill by operating segment are as follows:

	Operating Segments
In millions	Performance Chemicals		Performance Materials		Total
December 31, 2015	$	7.6	$	4.3	$	11.9
Foreign currency translation	0.5		—		0.5
December 31, 2016	$	8.1	$	4.3	$	12.4
Foreign currency translation	—		—		—
December 31, 2017	$	8.1	$	4.3	$	12.4

Schedule of Finite-Lived Intangible Assets

All of Ingevity's other intangible assets, net are related to the Performance Chemicals operating segment. The following table summarizes intangible assets:

	December 31, 2017						December 31, 2016
In millions	Gross carrying amount		Accumulated amortization		Net		Gross carrying amount		Accumulated amortization		Net
Brands (1)	$	13.9	$	11.8	$	2.1	$	13.9	$	11.3	$	2.6
Customer contracts and relationships	28.2		25.4		2.8		28.2		23.5		4.7
Other intangibles, net	$	42.1	$	37.2	$	4.9	$	42.1	$	34.8	$	7.3

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(1)    Represents trademarks, trade names and know-how.

Finite-lived Intangible Assets Amortization Expense

The amortization expense related to our intangible assets in the table above for the years ended December 31, 2017, 2016 and 2015 is shown in the table below. Amortization expense is included within "Cost of sales" and "Selling, general and administrative expenses" on our consolidated statements of operations.

	Years Ended December 31,
In millions	2017		2016		2015
Amortization expense	$	2.4	$	2.7	$	3.2