Intangible Assets

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The gross carrying amount and accumulated amortization for intangible assets consisted of the following ($ in millions):


	September 30, 2020
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange		Net Carrying Amount
Amortized Intangible Assets (AMS)
Customer relationships	$	339.2	$	82.8	$	—	$	(0.3)	$	256.7
Developed technology	42.1		13.2		—		0.2		28.7
Trade names	32.6		1.3		20.7		0.3		10.3
Non-compete agreements	2.9		2.3		—		—		0.6
Patents	1.5		0.5		—		—		1.0


Total	$	418.3	$	100.1	$	20.7	$	0.2	$	297.3

Unamortized Intangible Assets (AMS)
Trade names	$	20.0	$	—	$	0.1	$	(0.2)	$	20.1


	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange		Net Carrying Amount
Amortized Intangible Assets (AMS)
Customer relationships	$	276.3	$	67.7	$	—	$	1.8	$	206.8
Developed technology	34.0		10.9		—		0.4		22.7

Trade names	21.8		0.8		20.7		0.3		—
Non-compete agreements	2.9		2.2		—		—		0.7
Patents	1.5		0.4		—		—		1.1


Total	$	336.5	$	82.0	$	20.7	$	2.5	$	231.3

Unamortized Intangible Assets (AMS)
Trade names	$	20.0	$	—	$	0.1	$	—	$	19.9

Amortization expense of intangible assets was $6.8 million and $5.1 million for the three months ended September 30, 2020 and 2019, respectively, and $18.1 million and $15.3 million for the nine months ended September 30, 2020 and 2019, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $25.2 million in each of the next five years.