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Goodwill and Identifiable Assets (Notes) | 9 Months Ended
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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 acquisition | 41.4 |  |  | — |  |  | — |  |  | 41.4 |
Translation adjustment | — |  |  | (0.3) |  |  | — |  |  | (0.3) |
Balance as of December 31, 2019 | 703.5 |  |  | 230.5 |  |  | 552.9 |  |  | 1,486.9 |
Blackstone Federal acquisition | — |  |  | — |  |  | 61.1 |  |  | 61.1 |
LeapFrog acquisition | 42.4 |  |  | — |  |  | — |  |  | 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, 2020 |  | December 31, 2019
| 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 | 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 |
2021 | 46.6 |
2022 | 38.4 |
2023 | 33.5 |
2024 | 26.2 |
Thereafter | 79.7 |
| $ | 237.9 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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