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Goodwill and Identifiable Assets (Tables) | 6 Months Ended
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Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill by segment for the six months ended June 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 |
Translation adjustment | (0.5 | ) |  | (0.2 | ) |  | — |  |  | (0.7 | )
Balance as of June 30, 2020 | $ | 703.0 |  |  | $ | 230.3 |  |  | $ | 614.0 |  |  | $ | 1,547.3 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consisted of the following (in millions):
|  |  | June 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
Subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Customer and contractual relationships | 2 - 12.75 |  | $ | 403.6 |  |  | $ | 200.4 |  |  | $ | 203.2 |  |  | $ | 384.9 |  |  | $ | 179.9 |  |  | $ | 205.0 |
Contractor relationships | 2 - 5 |  | 71.1 |  |  | 70.7 |  |  | 0.4 |  |  | 71.1 |  |  | 70.6 |  |  | 0.5 |
Backlog | 1 - 2.75 |  | 28.3 |  |  | 25.9 |  |  | 2.4 |  |  | 25.0 |  |  | 23.9 |  |  | 1.1 |
Non-compete agreements | 2 - 7 |  | 25.6 |  |  | 15.9 |  |  | 9.7 |  |  | 24.8 |  |  | 13.8 |  |  | 11.0 |
In-use software | 6 |  | 18.9 |  |  | 18.9 |  |  | — |  |  | 18.9 |  |  | 18.9 |  |  | — |
|  |  | 547.5 |  |  | 331.8 |  |  | 215.7 |  |  | 524.7 |  |  | 307.1 |  |  | 217.6 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 258.9 |  |  | — |  |  | 258.9 |  |  | 258.9 |  |  | — |  |  | 258.9 |
Total |  |  | $ | 806.4 |  |  | $ | 331.8 |  |  | $ | 474.6 |  |  | $ | 783.6 |  |  | $ | 307.1 |  |  | $ | 476.5 |
Schedule of Estimated Future Amortization Expense | Estimated future amortization expense is as follows (in millions):
Remainder of 2020 | $ | 25.1 |
2021 | 41.0 |
2022 | 32.7 |
2023 | 28.0 |
2024 | 21.2 |
Thereafter | 67.7 |
| $ | 215.7 |

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