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Goodwill and Identifiable Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Identifiable Intangible Assets | 6. Goodwill and Other Identifiable Intangible Assets 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 |
_____ (1) For the 2020 and 2019 acquisitions, approximately $77.1 million and $63.3 million of the goodwill was deductible for income tax purposes, respectively. 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 |
_____ (1) The 2020 and 2019 acquisitions added $62.9 million in acquired intangible assets with a weighted-average useful life of 7.5 years and $42.8 million in acquired identified intangible assets with a weighted-average useful life of 10.5 years, respectively. 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 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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