Goodwill and Other Intangible Assets, net (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

	Reporting Units
In millions	Performance Chemicals		Performance Materials		Total
December 31, 2019	$	432.1	$	4.3	$	436.4
Foreign currency translation	8.9		—		8.9
December 31, 2020	$	441.0	$	4.3	$	445.3
Foreign currency translation	(3.3)		—		(3.3)
December 31, 2021	$	437.7	$	4.3	$	442.0

Schedule of Finite-Lived Intangible Assets

	December 31, 2021						December 31, 2020
In millions	Gross		Accumulated amortization		Net		Gross		Accumulated amortization		Net
Customer contracts and relationships	$	317.8	$	95.0	$	222.8	$	319.5	$	73.6	$	245.9
Brands (1)	81.7		20.3		61.4		82.4		15.8		66.6
Developed technology	72.2		18.8		53.4		73.0		12.5		60.5
Other	0.5		0.5		—		2.7		2.4		0.3
Other intangibles, net (2)	$	472.2	$	134.6	$	337.6	$	477.6	$	104.3	$	373.3

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

(2) The weighted average amortization period remaining for all intangibles is 11.7 years, while the weighted average amortization period remaining for customer contracts and relationships, brands, developed technology and other intangibles is 11.5 years, 14.0 years, 9.8 years, and 0.1 years, respectively.

Intangible assets subject to amortization were allocated among our business segments as follows:

	December 31,
In millions	2021		2020
Performance Materials	$	1.9	$	2.1
Performance Chemicals	335.7		371.2
Other intangibles, net	$	337.6	$	373.3

Finite-lived Intangible Assets Amortization Expense

The amortization expense related to our intangible assets in the table above is shown in the table below.

	Years Ended December 31,
In millions	2021		2020		2019
Cost of sales	$	—	$	0.1	$	0.6
Selling, general, and administrative expenses	33.2		32.5		28.1
Total amortization expense	$	33.2	$	32.6	$	28.7