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Goodwill and Identifiable Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table summarizes the activity related to the carrying amount of goodwill by reportable segment for the years ended December 31, 2020 and 2019 (in millions):
| Apex Segment |  | Oxford Segment |  | ECS Segment |  | Total
Balance as of December 31, 2018 | $ | 662.1 |  |  | $ | 230.8 |  |  | $ | 528.2 |  |  | $ | 1,421.1 |
2019 acquisitions(1) | 41.4 |  |  | — |  |  | 24.7 |  |  | 66.1 |
Translation adjustment | — |  |  | (0.3) |  |  | — |  |  | (0.3) |
Balance as of December 31, 2019 | 703.5 |  |  | 230.5 |  |  | 552.9 |  |  | 1,486.9 |
2020 acquisitions(1) | 40.3 |  |  | — |  |  | 89.2 |  |  | 129.5 |
Translation adjustment | (0.1) |  |  | 2.1 |  |  | — |  |  | 2.0 |
Balance as of December 31, 2020 | $ | 743.7 |  |  | $ | 232.6 |  |  | $ | 642.1 |  |  | $ | 1,618.4 |
Schedule of Acquired Intangible Assets | Acquired intangible assets consisted of the following (in millions):
|  |  |  | December 31, 2020 |  | December 31, 2019
|  | Estimated Useful Life (in years) |  | Gross Carrying Amount(1) |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount(1) |  | Accumulated Amortization |  | Net Carrying Amount
Subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer and contractual relationships |  | 7.3 - 12.75 |  | $ | 441.3 |  |  | $ | 222.9 |  |  | $ | 218.4 |  |  | $ | 384.9 |  |  | $ | 179.9 |  |  | $ | 205.0 |
Contractor relationships |  | 4 |  | 71.2 |  |  | 71.0 |  |  | 0.2 |  |  | 71.1 |  |  | 70.6 |  |  | 0.5 |
Contract Backlog |  | 1 - 2.75 |  | 29.3 |  |  | 28.5 |  |  | 0.8 |  |  | 25.0 |  |  | 23.9 |  |  | 1.1 |
Non-compete agreements |  | 4 - 7 |  | 27.8 |  |  | 18.2 |  |  | 9.6 |  |  | 24.8 |  |  | 13.8 |  |  | 11.0 |
|  |  |  | 569.6 |  |  | 340.6 |  |  | 229.0 |  |  | 505.8 |  |  | 288.2 |  |  | 217.6 |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  |  | 258.9 |  |  | — |  |  | 258.9 |  |  | 258.9 |  |  | — |  |  | 258.9 |
Total |  |  |  | $ | 828.5 |  |  | $ | 340.6 |  |  | $ | 487.9 |  |  | $ | 764.7 |  |  | $ | 288.2 |  |  | $ | 476.5 |
Schedule of Estimated Future Amortization Expense | Amortization expense for intangible assets with finite lives was $51.7 million in 2020, $51.1 million in 2019 and $58.5 million in 2018. Estimated amortization for each of the next five years and thereafter follows (in millions):
2021 | $ | 47.8 |
2022 | 39.1 |
2023 | 33.9 |
2024 | 26.6 |
2025 | 21.5 |
Thereafter | 60.1 |
| $ | 229.0 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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