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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contracts with Customers [Abstract] |
Disaggregation of Revenue | The following table disaggregates our revenue by major source (product line) for the years ended December 31, 2020, 2019 and 2018:
|  | Year Ended December 31, |
(millions of dollars) |  | 2020 |  |  | 2019 |  |  | 2018 |
Net Sales |  |  |  |  |  |  |  |  |
Metalcasting |  | $ | 258.1 |  |  | $ | 291.2 |  |  | $ | 328.9 |
Household, Personal Care & Specialty Products |  |  | 380.2 |  |  |  | 376.6 |  |  |  | 348.5 |
Environmental Products |  |  | 58.6 |  |  |  | 86.6 |  |  |  | 80.3 |
Building Materials |  |  | 55.9 |  |  |  | 68.9 |  |  |  | 70.4 |
Performance Materials |  |  | 752.8 |  |  |  | 823.3 |  |  |  | 828.1 |
Paper PCC |  |  | 308.4 |  |  |  | 364.9 |  |  |  | 378.5 |
Specialty PCC |  |  | 69.3 |  |  |  | 69.1 |  |  |  | 66.9 |
Ground Calcium Carbonate |  |  | 89.3 |  |  |  | 91.3 |  |  |  | 91.0 |
Talc |  |  | 43.9 |  |  |  | 49.1 |  |  |  | 52.9 |
Specialty Minerals |  |  | 510.9 |  |  |  | 574.4 |  |  |  | 589.3 |
Refractory Products |  |  | 212.3 |  |  |  | 244.8 |  |  |  | 261.1 |
Metallurgical Products |  |  | 45.8 |  |  |  | 53.3 |  |  |  | 50.8 |
Refractories |  |  | 258.1 |  |  |  | 298.1 |  |  |  | 311.9 |
Energy Services |  |  | 73.0 |  |  |  | 95.2 |  |  |  | 78.3 |
Total |  | $ | 1,594.8 |  |  | $ | 1,791.0 |  |  | $ | 1,807.6 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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