Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of carrying amount of goodwill attributable to each operating segment and the changes in those balances during the period

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

Summary of net book value of other intangible assets

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

Summary of estimated amortization expenses

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