Goodwill and Identifiable Assets (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

The following table summarizes the activity related to the carrying amount of goodwill by reportable segment for the three months ended March 31, 2021 and the year ended December 31, 2020 (in millions):


	Apex Segment		Oxford Segment		ECS Segment		Total




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
Purchase price adjustments	—		—		0.2		0.2
Translation adjustment	(0.1)		(1.0)		—		(1.1)
Balance as of March 31, 2021	$	743.6	$	231.6	$	642.3	$	1,617.5

Schedule of Acquired Intangible Assets

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


		March 31, 2021						December 31, 2020
	Estimated Useful Life in Years	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer and contractual relationships	7.3 - 12.8	$	440.9	$	233.4	$	207.5	$	441.3	$	222.9	$	218.4
Contractor relationships	4.0	71.1		71.0		0.1		71.2		71.0		0.2
Contract Backlog	1.0 - 2.8	29.3		28.7		0.6		29.3		28.5		0.8
Non-compete agreements	3.0 - 5.0	27.8		19.3		8.5		27.8		18.2		9.6

		569.1		352.4		216.7		569.6		340.6		229.0
Not subject to amortization:
Trademarks		258.9		—		258.9		258.9		—		258.9
Total		$	828.0	$	352.4	$	475.6	$	828.5	$	340.6	$	487.9

Schedule of Estimated Future Amortization Expense

Estimated future amortization expense follows (in millions):


Remainder of 2021	$	35.6
2022	39.1
2023	33.9
2024	26.6
2025	21.5
Thereafter	60.0
	$	216.7