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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Sep. 27, 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 nine-month periods ended September 27, 2020 and September 29, 2019 :
(millions of dollars) |  | Three Months Ended |  |  | Nine Months Ended |
Net Sales |  | Sep. 27, 2020 |  |  | Sep. 29, 2019 |  |  | Sep. 27, 2020 |  |  | Sep. 29, 2019 |
Metalcasting |  | $ | 66.3 |  |  | $ | 69.0 |  |  | $ | 180.8 |  |  | $ | 218.0 |
Household, Personal Care & Specialty Products |  |  | 93.9 |  |  |  | 94.1 |  |  |  | 278.0 |  |  |  | 280.4 |
Environmental Products |  |  | 16.9 |  |  |  | 27.1 |  |  |  | 48.3 |  |  |  | 72.0 |
Building Materials |  |  | 13.5 |  |  |  | 17.1 |  |  |  | 43.5 |  |  |  | 51.5 |
Performance Materials |  |  | 190.6 |  |  |  | 207.3 |  |  |  | 550.6 |  |  |  | 621.9 |
Paper PCC |  |  | 74.5 |  |  |  | 90.2 |  |  |  | 225.1 |  |  |  | 271.9 |
Specialty PCC |  |  | 17.3 |  |  |  | 17.7 |  |  |  | 49.7 |  |  |  | 53.1 |
Ground Calcium Carbonate |  |  | 23.2 |  |  |  | 23.0 |  |  |  | 66.4 |  |  |  | 70.1 |
Talc |  |  | 10.1 |  |  |  | 12.2 |  |  |  | 30.8 |  |  |  | 37.5 |
Specialty Minerals |  |  | 125.1 |  |  |  | 143.1 |  |  |  | 372.0 |  |  |  | 432.6 |
Refractory Products |  |  | 48.8 |  |  |  | 61.3 |  |  |  | 151.7 |  |  |  | 184.3 |
Metallurgical Products |  |  | 10.5 |  |  |  | 12.1 |  |  |  | 32.5 |  |  |  | 40.4 |
Refractories |  |  | 59.3 |  |  |  | 73.4 |  |  |  | 184.2 |  |  |  | 224.7 |
Energy Services |  |  | 13.3 |  |  |  | 25.5 |  |  |  | 56.2 |  |  |  | 71.6 |
Total |  | $ | 388.3 |  |  | $ | 449.3 |  |  | $ | 1,163.0 |  |  | $ | 1,350.8 |

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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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