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Goodwill and Other Intangible Assets | 6 Months Ended
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Jun. 30, 2024
Goodwill and Other Intangible Assets [Abstract] |
Goodwill and Other Intangible Assets | Note 8. Goodwill and Other Intangible Assets Goodwill and other intangible assets with indefinite lives are not amortized, but instead are assessed for impairment, at least annually. The carrying amount of goodwill was $912.8 million and $913.6 million as of June 30, 2024 and December 31, 2023, respectively. The net change in goodwill from December 31, 2023 to June 30, 2024 is attributable to the effects of foreign exchange. Acquired intangible assets subject to amortization as of June 30, 2024 and December 31, 2023 were as follows:
|  |  |  |  | Jun. 30, 2024 |  |  | Dec. 31, 2023 |
(in millions of dollars) |  | Weighted Average Useful Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Tradenames |  |  | 34 |  |  | $ | 221.3 |  |  | $ | 61.6 |  |  | $ | 221.5 |  |  | $ | 59.1 |
Technology |  |  | 13 |  |  |  | 18.8 |  |  |  | 14.9 |  |  |  | 18.8 |  |  |  | 14.2 |
Patents and trademarks |  |  | 19 |  |  |  | 6.4 |  |  |  | 6.4 |  |  |  | 6.4 |  |  |  | 6.4 |
Customer relationships |  |  | 21 |  |  |  | 78.4 |  |  |  | 17.3 |  |  |  | 79.0 |  |  |  | 15.0 |
|  |  | 29 |  |  | $ | 324.9 |  |  | $ | 100.2 |  |  | $ | 325.7 |  |  | $ | 94.7 |
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 29 years. Estimated amortization expense is $6.8 million for the remainder of 2024, $47.8 million for 2025–2028 and $170.1 million thereafter.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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