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Goodwill and Other Intangible Assets | 6 Months Ended
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Jun. 30, 2019
Goodwill and Other Intangible Assets [Abstract] |
Goodwill and Other Intangible Assets | Note 9. 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 $807.9 and $812.4 million as of June 30, 2019 and December 31, 2018, respectively. The change in goodwill from December 31, 2018 to June 30, 2019 is attributable to the effects of foreign exchange. Intangible assets subject to amortization as of June 30, 2019 and December 31, 2018 were as follows:
|  |  |  |  | June 30, 2019 |  |  | Dec. 31, 2018 |
(millions of dollars) |  | Weighted Average Useful Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Tradenames |  |  | 35 |  |  | $ | 203.9 |  |  | $ | 29.5 |  |  | $ | 204.2 |  |  | $ | 26.6 |
Technology |  |  | 13 |  |  |  | 18.8 |  |  |  | 7.2 |  |  |  | 18.8 |  |  |  | 6.4 |
Patents |  |  | 19 |  |  |  | 6.4 |  |  |  | 5.8 |  |  |  | 6.4 |  |  |  | 5.6 |
Customer relationships |  |  | 22 |  |  |  | 25.1 |  |  |  | 3.8 |  |  |  | 26.5 |  |  |  | 3.2 |
|  |  | 32 |  |  | $ | 254.2 |  |  | $ | 46.3 |  |  | $ | 255.9 |  |  | $ | 41.8 |
The weighted average amortization period for acquired intangible assets subject to amortization is approximately 32 years. Estimated amortization expense is $4.8 million for the remainder of 2019, $36.7 million for 2020–2023 and $166.4 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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