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Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

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


	June 30, 2021
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange		Net Carrying Amount
Amortized Intangible Assets
Customer relationships	$	540.9	$	102.6	$	—	$	(1.9)	$	440.2
Developed technology	79.4		16.8		—		0.1		62.5
Trade names	40.4		2.0		20.7		0.3		17.4
Non-compete agreements	2.9		2.4		—		—		0.5
Patents	1.5		0.6		—		—		0.9


Total	$	665.1	$	124.4	$	20.7	$	(1.5)	$	521.5

Unamortized Intangible Assets
Trade names	$	20.0	$	—	$	0.1	$	(0.3)	$	20.2


	December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Accumulated Impairments		Accumulated Foreign Exchange		Net Carrying Amount
Amortized Intangible Assets
Customer relationships	$	339.8	$	88.5	$	—	$	(2.9)	$	254.2
Developed technology	42.1		14.1		—		(0.2)		28.2

Trade names	32.7		1.4		20.7		0.3		10.3
Non-compete agreements	2.9		2.4		—		—		0.5
Patents	1.5		0.5		—		—		1.0


Total	$	419.0	$	106.9	$	20.7	$	(2.8)	$	294.2

Unamortized Intangible Assets
Trade names	$	20.0	$	—	$	0.1	$	(0.6)	$	20.5

Amortization expense of intangible assets was $10.7 million and $6.4 million for the three months ended June 30, 2021 and 2020, respectively, and $17.2 million and $11.3 million for the six months ended June 30, 2021 and 2020, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $44.9 million in each of the next five years.