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Goodwill and Other Intangible Assets | 9 Months Ended
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Oct. 03, 2021
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 $909.8 million and $808.5 million as of October 3, 2021 and December 31, 2020, respectively. The net change in goodwill from December 31, 2020 to October 3, 2021 is primarily attributable to the acquisition of Normerica (see Note 3 to the Condensed Consolidated Financial Statements) and to the effects of foreign exchange. Intangible assets subject to amortization as of October 3, 2021 and December 31, 2020 were as follows:
|  |  |  |  | October 3, 2021 |  |  | December 31, 2020 |
(millions of dollars) |  | Weighted Average Useful Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Tradenames |  |  | 34 |  |  | $ | 219.9 |  |  | $ | 43.1 |  |  | $ | 203.9 |  |  | $ | 38.6 |
Technology |  |  | 13 |  |  |  | 18.8 |  |  |  | 10.8 |  |  |  | 18.8 |  |  |  | 9.6 |
Patents and trademarks |  |  | 19 |  |  |  | 6.4 |  |  |  | 6.3 |  |  |  | 6.4 |  |  |  | 6.1 |
Customer relationships |  |  | 21 |  |  |  | 76.4 |  |  |  | 7.3 |  |  |  | 26.9 |  |  |  | 5.9 |
|  |  | 31 |  |  | $ | 321.5 |  |  | $ | 67.5 |  |  | $ | 256.0 |  |  | $ | 60.2 |
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 31 years. Estimated amortization expense is $3.2 million for the remainder of 2021, $49.5 million for 2022–2025 and $201.3 million thereafter.

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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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