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Goodwill and Identifiable Assets (Tables) | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | 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 |
Schedule of Acquired Intangible Assets | 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 |
Schedule of Estimated Future Amortization Expense | 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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