Goodwill and Identifiable Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

6. Goodwill and Other Identifiable Intangible Assets

The following table summarizes the activity related to the carrying amount of goodwill by reportable segment for the years ended December 31, 2020 and 2019 (in millions):


	Apex Segment		Oxford Segment		ECS Segment		Total
Balance as of December 31, 2018	$	662.1	$	230.8	$	528.2	$	1,421.1
2019 acquisitions(1)	41.4		—		24.7		66.1
Translation adjustment	—		(0.3)		—		(0.3)
Balance as of December 31, 2019	703.5		230.5		552.9		1,486.9
2020 acquisitions(1)	40.3		—		89.2		129.5
Translation adjustment	(0.1)		2.1		—		2.0
Balance as of December 31, 2020	$	743.7	$	232.6	$	642.1	$	1,618.4

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(1) For the 2020 and 2019 acquisitions, approximately $77.1 million and $63.3 million of the goodwill was deductible for income tax purposes, respectively.

Acquired intangible assets consisted of the following (in millions):


		December 31, 2020						December 31, 2019
	Estimated Useful Life (in years)	Gross Carrying Amount(1)		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount(1)		Accumulated Amortization		Net Carrying Amount
Subject to amortization:
Customer and contractual relationships	7.3 - 12.75	$	441.3	$	222.9	$	218.4	$	384.9	$	179.9	$	205.0
Contractor relationships	4	71.2		71.0		0.2		71.1		70.6		0.5
Contract Backlog	1 - 2.75	29.3		28.5		0.8		25.0		23.9		1.1
Non-compete agreements	4 - 7	27.8		18.2		9.6		24.8		13.8		11.0
		569.6		340.6		229.0		505.8		288.2		217.6
Not subject to amortization:
Trademarks		258.9		—		258.9		258.9		—		258.9
Total		$	828.5	$	340.6	$	487.9	$	764.7	$	288.2	$	476.5

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(1) The 2020 and 2019 acquisitions added $62.9 million in acquired intangible assets with a weighted-average useful life of 7.5 years and $42.8 million in acquired identified intangible assets with a weighted-average useful life of 10.5 years, respectively.

Amortization expense for intangible assets with finite lives was $51.7 million in 2020, $51.1 million in 2019 and $58.5 million in 2018. Estimated amortization for each of the next five years and thereafter follows (in millions):


2021	$	47.8
2022	39.1
2023	33.9
2024	26.6
2025	21.5
Thereafter	60.1
	$	229.0