Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill by segment

The changes in the carrying amount of goodwill were as follows:

(dollars in millions)	Electronics		Industrial & Specialty			Total
Balance at December 31, 2020	$	1,274.0	$	978.7	(1)	$	2,252.7
Foreign currency translation	(12.7)		(15.0)			(27.7)
Balance at March 31, 2021	$	1,261.3	$	963.7		$	2,225.0

(1) Includes accumulated impairment losses of $46.6 million.

Schedule of finite-lived intangible assets subject to amortization

Intangible assets subject to amortization were as follows:

	March 31, 2021						December 31, 2020
(dollars in millions)	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Customer relationships	$	972.4	$	(448.4)	$	524.0	$	984.3	$	(435.4)	$	548.9
Developed technology	362.7		(215.4)		147.3		400.0		(241.5)		158.5
Tradenames	90.3		(12.2)		78.1		91.8		(11.3)		80.5
Other	—		—		—		1.7		(1.7)		—
Total	$	1,425.4	$	(676.0)	$	749.4	$	1,477.8	$	(689.9)	$	787.9