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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in the Net Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the fiscal years 2023 and 2022 are included in the tables below (in millions of dollars):
|  | As of Year-End 2022 |  | Additions to Goodwill |  | Impairment Adjustments |  | As of Year-End 2023
Science, Engineering & Technology |  | $ | 111.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 111.3 |
Education |  | 39.8 |  |  | — |  |  | — |  |  | 39.8 |
Outsourcing & Consulting |  | — |  |  | — |  |  | — |  |  | — |
Total |  | $ | 151.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 151.1 |
|  | As of Year-End 2021 |  | Additions to Goodwill |  | Impairment Adjustments |  | As of Year-End 2022
Science, Engineering & Technology |  | $ | 111.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 111.3 |
Education |  | 3.5 |  |  | 36.3 |  |  | — |  |  | 39.8 |
Outsourcing & Consulting |  | — |  |  | 41.0 |  |  | (41.0) |  |  | — |
Total |  | $ | 114.8 |  |  | $ | 77.3 |  |  | $ | (41.0) |  |  | $ | 151.1 |
Schedule of Finite-Lived Intangible Assets | Intangible assets, excluding fully-amortized intangibles, are included within other assets on our consolidated balance sheet and consist of the following (in millions of dollars):
|  |  | 2023 |  | 2022
| Useful Lives |  | Gross Carrying Amount |  | Less: Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Less: Accumulated Amortization |  | Net
Customer relationships | 10-15 years |  | $ | 141.1 |  |  | $ | 47.7 |  |  | $ | 93.4 |  |  | $ | 141.1 |  |  | $ | 32.9 |  |  | $ | 108.2 |
Trade names | 10-15 years |  | 51.6 |  |  | 12.8 |  |  | 38.8 |  |  | 51.7 |  |  | 8.3 |  |  | 43.4 |
Non-compete agreements | 5 years |  | 4.3 |  |  | 1.7 |  |  | 2.6 |  |  | 6.0 |  |  | 2.2 |  |  | 3.8 |
Trademarks | 10 years |  | 4.8 |  |  | 1.9 |  |  | 2.9 |  |  | 4.8 |  |  | 1.5 |  |  | 3.3 |
Total |  |  | $ | 201.8 |  |  | $ | 64.1 |  |  | $ | 137.7 |  |  | $ | 203.6 |  |  | $ | 44.9 |  |  | $ | 158.7 |

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