Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the years ended December 31, 2018 and 2017, are as follows:



(In millions)	Catalysts Technologies			Materials Technologies			Total Grace
Balance, December 31, 2016	$	353.5		$	40.7		$	394.2
Goodwill acquired during the year	—			2.4			2.4
Foreign currency translation	4.2			1.6			5.8
Balance, December 31, 2017	357.7			44.7			402.4
Goodwill acquired during the year	140.6			—			140.6
Foreign currency translation	(2.0		)	(0.6		)	(2.6		)
Balance, December 31, 2018	$	496.3		$	44.1		$	540.4

Grace’s net book value of other intangible assets at December 31, 2018 and 2017, was $356.5 million and $255.4 million, respectively, detailed as follows:



	12/31/2018				12/31/2017
(In millions)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Technology	$	226.2	$	52.4	$	214.7	$	41.5
Customer lists	161.2		15.7		55.8		8.8
Trademarks	29.8		4.0		25.5		2.6
Other	16.1		4.7		16.0		3.7
Total	$	433.3	$	76.8	$	312.0	$	56.6

Amortization expense related to intangible assets was $19.9 million, $15.4 million, and $13.9 million in 2018, 2017, and 2016, respectively.

At December 31, 2018, estimated future annual amortization expense for intangible assets is:



	(In millions)
2019	$	21.6
2020	21.6
2021	21.3
2022	21.2
2023	21.1
Thereafter	249.7
	$	356.5