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Intangible Assets

12 Months Ended

Dec. 31, 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):


	December 31, 2021
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized Intangible Assets

Customer relationships	$	541.7	$	119.2	$	422.5
Developed technology	74.6		20.7		53.9

Trade names	18.9		2.7		16.2
Non-compete agreements	2.9		2.5		0.4
Patents	1.5		0.6		0.9
Total	$	639.6	$	145.7	$	493.9

Unamortized Intangible Assets
Trade names	$	20.0	$	—	$	20.0


	December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized Intangible Assets

Customer relationships	$	343.9	$	89.7	$	254.2
Developed technology	42.4		14.2		28.2

Trade names	11.7		1.4		10.3
Non-compete agreements	2.9		2.4		0.5
Patents	1.5		0.5		1.0
Total	$	402.4	$	108.2	$	294.2

Unamortized Intangible Assets
Trade names	$	20.5	$	—	$	20.5

Amortization expense of intangible assets was $39.7 million, $24.6 million and $20.3 million for the years ended December 31, 2021, 2020 and 2019, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method.

The following table shows the estimated aggregate amortization expense for the next five years ($ in millions):


For the year ending December 31,	Estimated Amortization Expense
2022	$	44.5
2023	44.5
2024	44.2
2025	43.4
2026	43.4