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Goodwill and Intangible Assets (Tables)
 12 Months Ended
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 2022Additions to GoodwillImpairment AdjustmentsAs of Year-End 2023
Science, Engineering & Technology$111.3 $— $— $111.3 
Education39.8 — — 39.8 
Outsourcing & Consulting— — — — 
Total$151.1 $— $— $151.1 

As of Year-End 2021Additions to GoodwillImpairment AdjustmentsAs of Year-End 2022
Science, Engineering & Technology$111.3 $— $— $111.3 
Education3.5 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):
20232022
Useful LivesGross Carrying AmountLess: Accumulated AmortizationNetGross Carrying AmountLess: Accumulated AmortizationNet
Customer relationships10-15 years$141.1 $47.7 $93.4 $141.1 $32.9 $108.2 
Trade names10-15 years51.6 12.8 38.8 51.7 8.3 43.4 
Non-compete agreements5 years4.3 1.7 2.6 6.0 2.2 3.8 
Trademarks10 years4.8 1.9 2.9 4.8 1.5 3.3 
Total$201.8 $64.1 $137.7 $203.6 $44.9 $158.7