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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 28, 2020
Revenue from Contracts with Customers [Abstract] |
Disaggregation of Revenue | The following table disaggregates our revenue by major source (product line) for the three and six-month periods ended June 28, 2020 and June 30, 2019 :
(millions of dollars) |  | Three Months Ended |  |  | Six Months Ended |
Net Sales |  | Jun. 28, 2020 |  |  | Jun. 30, 2019 |  |  | Jun. 28, 2020 |  |  | Jun. 30, 2019 |
Metalcasting |  | $ | 52.8 |  |  | $ | 75.8 |  |  | $ | 114.5 |  |  | $ | 149.0 |
Household, Personal Care & Specialty Products |  |  | 87.9 |  |  |  | 91.5 |  |  |  | 184.1 |  |  |  | 186.3 |
Environmental Products |  |  | 19.9 |  |  |  | 29.0 |  |  |  | 31.4 |  |  |  | 44.9 |
Building Materials |  |  | 13.2 |  |  |  | 19.1 |  |  |  | 30.0 |  |  |  | 34.4 |
Performance Materials |  |  | 173.8 |  |  |  | 215.4 |  |  |  | 360.0 |  |  |  | 414.6 |
Paper PCC |  |  | 65.5 |  |  |  | 90.2 |  |  |  | 150.6 |  |  |  | 181.7 |
Specialty PCC |  |  | 14.9 |  |  |  | 17.3 |  |  |  | 32.4 |  |  |  | 35.4 |
Ground Calcium Carbonate |  |  | 20.6 |  |  |  | 24.8 |  |  |  | 43.2 |  |  |  | 47.1 |
Talc |  |  | 8.8 |  |  |  | 12.8 |  |  |  | 20.7 |  |  |  | 25.3 |
Specialty Minerals |  |  | 109.8 |  |  |  | 145.1 |  |  |  | 246.9 |  |  |  | 289.5 |
Refractory Products |  |  | 47.1 |  |  |  | 61.0 |  |  |  | 102.9 |  |  |  | 123.0 |
Metallurgical Products |  |  | 8.8 |  |  |  | 16.5 |  |  |  | 22.0 |  |  |  | 28.3 |
Refractories |  |  | 55.9 |  |  |  | 77.5 |  |  |  | 124.9 |  |  |  | 151.3 |
Energy Services |  |  | 17.7 |  |  |  | 25.8 |  |  |  | 42.9 |  |  |  | 46.1 |
Total |  | $ | 357.2 |  |  | $ | 463.8 |  |  | $ | 774.7 |  |  | $ | 901.5 |

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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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