Goodwill and Identifiable Assets (Notes)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Identifiable Intangible Assets

5. Goodwill and Identifiable Intangible Assets

The changes in the carrying amount of goodwill for the six months ended June 30, 2019 and the year ended December 31, 2018 were as follows (in millions):

	Apex Segment		Oxford Segment			ECS Segment		Total
Balance as of December 31, 2017	$	662.1	$	232.0		$	—	$	894.1
ECS acquisition	—		—			528.2		528.2
Translation adjustment	—		(1.2		)	—		(1.2		)
Balance as of December 31, 2018	662.1		230.8			528.2		1,421.1
DHA acquisition	—		—			24.7		24.7
Translation adjustment	—		(0.2		)	—		(0.2		)
Balance as of June 30, 2019	$	662.1	$	230.6		$	552.9	$	1,445.6

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

		June 30, 2019						December 31, 2018
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Subject to amortization:
Customer and contractual relationships	2 - 12.75 years	$	362.4	$	162.4	$	200.0	$	346.9	$	145.4	$	201.5
Contractor relationships	2 - 5 years	71.0		70.4		0.6		71.1		67.1		4.0
Backlog	1 - 2.75 years	25.0		20.7		4.3		23.1		17.7		5.4
Non-compete agreements	2 - 7 years	23.6		11.9		11.7		22.1		9.9		12.2
In-use software	6 years	18.9		17.5		1.4		18.9		16.0		2.9
Favorable contracts	5 years	—		—		—		1.4		0.9		0.5
		500.9		282.9		218.0		483.5		257.0		226.5
Not subject to amortization:
Trademarks(1)		258.9		—		258.9		262.2		—		262.2
Total		$	759.8	$	282.9	$	476.9	$	745.7	$	257.0	$	488.7

____

(1) Certain foreign trademarks totaling $3.3 million were written off during the second quarter of 2019.

Estimated future amortization expense is as follows (in millions): 

Remainder of 2019	$	23.6
2020	38.1
2021	32.6
2022	24.9
2023	21.7
Thereafter	77.1
	$	218.0