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Goodwill and Identifiable Assets (Notes)
 9 Months Ended
Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Identifiable Intangible Assets
4. Goodwill and Identifiable Intangible Assets

Changes in the carrying amount of goodwill by segment for the nine months ended September 30, 2020 and the year ended December 31, 2019 were as follows (in millions):
Apex Oxford ECS Total
Balance as of December 31, 2018$662.1 $230.8 $528.2 $1,421.1 
DHA acquisition— — 24.7 24.7 
Intersys acquisition41.4 — — 41.4 
Translation adjustment— (0.3)— (0.3)
Balance as of December 31, 2019703.5 230.5 552.9 1,486.9 
Blackstone Federal acquisition— — 61.1 61.1 
LeapFrog acquisition42.4 — — 42.4 
Translation adjustment(0.4)0.9 — 0.5 
Balance as of September 30, 2020
$745.5 $231.4 $614.0 $1,590.9 
Acquired intangible assets consisted of the following (in millions):
September 30, 2020December 31, 2019
Estimated Useful Life in YearsGross Carrying AmountAccumulated AmortizationNet Carrying AmountGross Carrying AmountAccumulated AmortizationNet Carrying Amount
Customer and contractual relationships
2 - 12.75
$437.3 $211.2 $226.1 $384.9 $179.9 $205.0 
Contractor relationships
2 - 5
71.1 70.9 0.2 71.1 70.6 0.5 
Backlog
1 - 2.75
28.3 27.1 1.2 25.0 23.9 1.1 
Non-compete agreements
2 - 7
27.4 17.0 10.4 24.8 13.8 11.0 
In-use software
6
18.9 18.9 — 18.9 18.9 — 
583.0 345.1 237.9 524.7 307.1 217.6 
Trademarks (not amortized)258.9 — 258.9 258.9 — 258.9 
Total$841.9 $345.1 $496.8 $783.6 $307.1 $476.5 

Estimated future amortization expense is as follows (in millions): 
Remainder of 2020$13.5 
202146.6 
202238.4 
202333.5 
202426.2 
Thereafter79.7 
$237.9