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v3.19.1

Goodwill and Identifiable Assets (Notes) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Identifiable Intangible Assets | 4. Goodwill and Identifiable Intangible Assets The changes in the carrying amount of goodwill for the three months ended March 31, 2019 and the year ended December 31, 2018 were as follows (in millions):
| Apex Segment |  | Oxford Segment |  | ECS Segment |  | Total
Balance as of December 31, 2017 | $ | 662.1 |  |  | $ | 232.0 |  |  | $ | — |  |  | $ | 894.1 |
ECS acquisition | — |  |  | — |  |  | 528.2 |  |  | 528.2 |
Translation adjustment | — |  |  | (1.2 | ) |  | — |  |  | (1.2 | )
Balance as of December 31, 2018 | 662.1 |  |  | 230.8 |  |  | 528.2 |  |  | 1,421.1 |
DHA acquisition | — |  |  | — |  |  | 24.8 |  |  | 24.8 |
Translation adjustment | — |  |  | (0.4 | ) |  | — |  |  | (0.4 | )
Balance as of March 31, 2019 | $ | 662.1 |  |  | $ | 230.4 |  |  | $ | 553.0 |  |  | $ | 1,445.5 |
Acquired intangible assets consisted of the following (in millions):
|  |  | March 31, 2019 |  | December 31, 2018
| Estimated Useful Life |  | 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 years |  | $ | 362.4 |  |  | $ | 153.8 |  |  | $ | 208.6 |  |  | $ | 346.9 |  |  | $ | 145.4 |  |  | $ | 201.5 |
Contractor relationships | 2 - 5 years |  | 71.1 |  |  | 69.0 |  |  | 2.1 |  |  | 71.1 |  |  | 67.1 |  |  | 4.0 |
Backlog | 1 - 2.75 years |  | 25.0 |  |  | 19.2 |  |  | 5.8 |  |  | 23.1 |  |  | 17.7 |  |  | 5.4 |
Non-compete agreements | 2 - 7 years |  | 23.6 |  |  | 10.9 |  |  | 12.7 |  |  | 22.1 |  |  | 9.9 |  |  | 12.2 |
In-use software | 6 years |  | 18.9 |  |  | 16.8 |  |  | 2.1 |  |  | 18.9 |  |  | 16.0 |  |  | 2.9 |
Favorable contracts | 5 years |  | — |  |  | — |  |  | — |  |  | 1.4 |  |  | 0.9 |  |  | 0.5 |
|  |  | 501.0 |  |  | 269.7 |  |  | 231.3 |  |  | 483.5 |  |  | 257.0 |  |  | 226.5 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 262.1 |  |  | — |  |  | 262.1 |  |  | 262.2 |  |  | — |  |  | 262.2 |
Total |  |  | $ | 763.1 |  |  | $ | 269.7 |  |  | $ | 493.4 |  |  | $ | 745.7 |  |  | $ | 257.0 |  |  | $ | 488.7 |
Estimated future amortization expense is as follows (in millions):
Remainder of 2019 | $ | 36.8 |
2020 | 38.1 |
2021 | 32.6 |
2022 | 24.9 |
2023 | 21.7 |
Thereafter | 77.2 |
| $ | 231.3 |

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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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