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Goodwill and Identifiable Assets (Tables) | 9 Months Ended
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Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | 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 |
Schedule of Acquired Intangible Assets | 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 |
Schedule of Estimated Future Amortization Expense | 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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