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v3.20.1

Goodwill and Identifiable Assets (Notes) | 3 Months Ended
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Mar. 31, 2020
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 three months ended March 31, 2020 and the year ended December 31, 2019 were as follows (in millions):
| Apex Segment |  | Oxford Segment |  | ECS Segment |  | 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 |
Translation adjustment | (0.3 | ) |  | (0.7 | ) |  | — |  |  | (1.0 | )
Balance as of March 31, 2020 | $ | 703.2 |  |  | $ | 229.8 |  |  | $ | 614.0 |  |  | $ | 1,547.0 |
Acquired intangible assets consisted of the following (in millions):
|  |  | March 31, 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
Subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer and contractual relationships | 2 - 12.75 |  | $ | 403.4 |  |  | $ | 189.9 |  |  | $ | 213.5 |  |  | $ | 384.9 |  |  | $ | 179.9 |  |  | $ | 205.0 |
Contractor relationships | 2 - 5 |  | 71.0 |  |  | 70.6 |  |  | 0.4 |  |  | 71.1 |  |  | 70.6 |  |  | 0.5 |
Backlog | 1 - 2.75 |  | 28.3 |  |  | 24.8 |  |  | 3.5 |  |  | 25.0 |  |  | 23.9 |  |  | 1.1 |
Non-compete agreements | 2 - 7 |  | 25.6 |  |  | 14.8 |  |  | 10.8 |  |  | 24.8 |  |  | 13.8 |  |  | 11.0 |
In-use software | 6 |  | 18.9 |  |  | 18.9 |  |  | — |  |  | 18.9 |  |  | 18.9 |  |  | — |
|  |  | 547.2 |  |  | 319.0 |  |  | 228.2 |  |  | 524.7 |  |  | 307.1 |  |  | 217.6 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 258.9 |  |  | — |  |  | 258.9 |  |  | 258.9 |  |  | — |  |  | 258.9 |
Total |  |  | $ | 806.1 |  |  | $ | 319.0 |  |  | $ | 487.1 |  |  | $ | 783.6 |  |  | $ | 307.1 |  |  | $ | 476.5 |
__ Estimated future amortization expense is as follows (in millions):
Remainder of 2020 | $ | 37.7 |
2021 | 41.0 |
2022 | 32.6 |
2023 | 28.0 |
2024 | 21.2 |
Thereafter | 67.7 |
| $ | 228.2 |

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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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