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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Other Intangible Assets [Abstract] |
Carrying Amount of Goodwill by Reportable Segment | The balance of goodwill by segment and the activity occurring in the past two fiscal years is as follows:
(millions of dollars) |  | Performance Materials |  |  | Specialty Minerals |  |  | Refractories |  |  | Consolidated |
Balance at December 31, 2017 |  | $ | 720.9 |  |  | $ | 12.7 |  |  | $ | 45.7 |  |  | $ | 779.3 |
Change in goodwill relating to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition of Sivomatic |  |  | 35.0 |  |  |  | — |  |  |  | — |  |  |  | 35.0 |
Foreign exchange translation |  |  | — |  |  |  | (0.4 | ) |  |  | (1.5 | ) |  |  | (1.9 | )
Total Changes |  | $ | 35.0 |  |  | $ | (0.4 | ) |  | $ | (1.5 | ) |  | $ | 33.1 |
Balance at December 31, 2018 |  | $ | 755.9 |  |  | $ | 12.3 |  |  | $ | 44.2 |  |  | $ | 812.4 |
Change in goodwill relating to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange translation |  |  | (4.7 | ) |  |  | 0.2 |  |  |  | (0.5 | ) |  |  | (5.0 | )
Total Changes |  | $ | (4.7 | ) |  | $ | 0.2 |  |  | $ | (0.5 | ) |  | $ | (5.0 | )
Balance at December 31, 2019 |  | $ | 751.2 |  |  | $ | 12.5 |  |  | $ | 43.7 |  |  | $ | 807.4 |
Acquired Intangible Assets Subject to Amortization | Acquired intangible assets subject to amortization as of December 31, 2019 and December 31, 2018 were as follows:
|  |  |  |  | December 31, 2019 |  |  | December 31, 2018 |
|  | Weighted Average Useful Life (Years) |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |  |  | Gross Carrying Amount |  |  | Accumulated Amortization |
Tradenames |  |  | 35 |  |  | $ | 203.9 |  |  | $ | 32.5 |  |  | $ | 204.2 |  |  | $ | 26.6 |
Technology |  |  | 13 |  |  |  | 18.8 |  |  |  | 8.0 |  |  |  | 18.8 |  |  |  | 6.4 |
Patents and trademarks |  |  | 19 |  |  |  | 6.4 |  |  |  | 5.9 |  |  |  | 6.4 |  |  |  | 5.6 |
Customer relationships |  |  | 22 |  |  |  | 24.7 |  |  |  | 4.4 |  |  |  | 26.5 |  |  |  | 3.2 |
|  |  | 32 |  |  | $ | 253.8 |  |  | $ | 50.8 |  |  | $ | 255.9 |  |  | $ | 41.8 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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