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Goodwill and Identifiable Assets (Notes)
 3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets Goodwill and Identifiable Intangible Assets
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 SegmentOxford SegmentECS SegmentTotal
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 
_____
(1) For the 2020 acquisitions, approximately $77.1 million of the goodwill was deductible for income tax purposes.

Acquired intangible assets consisted of the following (in millions):
March 31, 2021December 31, 2020
Estimated Useful Life in YearsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer and contractual relationships
7.3 - 12.8
$440.9 $233.4 $207.5 $441.3 $222.9 $218.4 
Contractor relationships4.071.1 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:
Trademarks258.9 — 258.9 258.9 — 258.9 
Total$828.0 $352.4 $475.6 $828.5 $340.6 $487.9 
Estimated future amortization expense follows (in millions): 
Remainder of 2021$35.6 
202239.1 
202333.9 
202426.6 
202521.5 
Thereafter60.0 
$216.7