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Goodwill and Identifiable Assets (Tables) | 6 Months Ended
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Jun. 30, 2021
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 since December 31, 2019 (in millions). For the businesses acquired since 2019, goodwill deductible for income tax purposes was approximately $124.3 million. See Note 9. Segment Reporting for more information on the change in our reportable segments.
| Commercial |  | Federal Government |  |  |  | Total
Balance as of December 31, 2019 | $ | 738.4 |  |  | $ | 552.9 |  |  |  |  | $ | 1,291.3 |
2020 acquisitions | 40.3 |  |  | 89.2 |  |  |  |  | 129.5 |
Translation adjustment | (0.1) |  |  | — |  |  |  |  | (0.1) |
Balance as of December 31, 2020 | 778.6 |  |  | 642.1 |  |  |  |  | 1,420.7 |
2021 acquisitions | 51.3 |  |  | — |  |  |  |  | 51.3 |
Purchase price adjustments | — |  |  | 3.5 |  |  |  |  | 3.5 |
Balance as of June 30, 2021 | $ | 829.9 |  |  | $ | 645.6 |  |  |  |  | $ | 1,475.5 |
___________________ Note: For the 2021 and 2020 acquisitions, approximately $47.2 million and $77.1 million of the goodwill was deductible for income tax purposes, respectively.
Schedule of Acquired Intangible Assets | Acquired intangible assets consisted of the following (in millions):
|  |  | June 30, 2021 |  | December 31, 2020 |  |
| 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 | 7.3 - 12.8 |  | $ | 457.4 |  |  | $ | 232.6 |  |  | $ | 224.8 |  |  | $ | 428.0 |  |  | $ | 211.3 |  |  | $ | 216.7 |  |  |
Contractor relationships | 4.0 |  | 45.5 |  |  | 45.4 |  |  | 0.1 |  |  | 45.5 |  |  | 45.3 |  |  | 0.2 |  |  |
Contract Backlog | 1.0 - 2.8 |  | 29.3 |  |  | 28.9 |  |  | 0.4 |  |  | 29.3 |  |  | 28.5 |  |  | 0.8 |  |  |
Non-compete agreements | 1.0 - 7.0 |  | 27.2 |  |  | 19.6 |  |  | 7.6 |  |  | 27.0 |  |  | 17.4 |  |  | 9.6 |  |  |
|  |  | 559.4 |  |  | 326.5 |  |  | 232.9 |  |  | 529.8 |  |  | 302.5 |  |  | 227.3 |  |  |
Not subject to amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trademarks |  |  | 242.6 |  |  | — |  |  | 242.6 |  |  | 242.6 |  |  | — |  |  | 242.6 |  |  |
Total |  |  | $ | 802.0 |  |  | $ | 326.5 |  |  | $ | 475.5 |  |  | $ | 772.4 |  |  | $ | 302.5 |  |  | $ | 469.9 |  |  |
Schedule of Estimated Future Amortization Expense | Estimated future amortization expense follows (in millions):
Remainder of 2021 | $ | 27.4 |
2022 | 43.9 |
2023 | 37.8 |
2024 | 29.7 |
2025 | 24.3 |
Thereafter | 69.8 |
| $ | 232.9 |

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