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v3.20.2

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | $ 388.3 | $ 449.3 | $ 1,163.0 | $ 1,350.8
Performance Materials [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 190.6 | 207.3 | 550.6 | 621.9
Performance Materials [Member] | Metalcasting [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 66.3 | 69.0 | 180.8 | 218.0
Performance Materials [Member] | Household, Personal Care & Specialty Products [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 93.9 | 94.1 | 278.0 | 280.4
Performance Materials [Member] | Environmental Products [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 16.9 | 27.1 | 48.3 | 72.0
Performance Materials [Member] | Building Materials [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 13.5 | 17.1 | 43.5 | 51.5
Specialty Minerals [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 125.1 | 143.1 | 372.0 | 432.6
Specialty Minerals [Member] | Paper PCC [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 74.5 | 90.2 | 225.1 | 271.9
Specialty Minerals [Member] | Specialty PCC [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 17.3 | 17.7 | 49.7 | 53.1
Specialty Minerals [Member] | Ground Calcium Carbonate [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 23.2 | 23.0 | 66.4 | 70.1
Specialty Minerals [Member] | Talc [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 10.1 | 12.2 | 30.8 | 37.5
Refractories [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 59.3 | 73.4 | 184.2 | 224.7
Refractories [Member] | Refractory Products [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 48.8 | 61.3 | 151.7 | 184.3
Refractories [Member] | Metallurgical Products [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | 10.5 | 12.1 | 32.5 | 40.4
Energy Services [Member] |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |
Total net sales | $ 13.3 | $ 25.5 | $ 56.2 | $ 71.6

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