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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 03, 2021 | Dec. 31, 2020 | Sep. 27, 2020 | Jun. 28, 2020 | Mar. 29, 2020 | Oct. 03, 2021 | Sep. 27, 2020 | Dec. 31, 2020
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | $ 473.2 |  | $ 388.3 |  |  | $ 1,381.4 | $ 1,163.0 |
Household, Personal Care & Specialty Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 121.8 |  | 93.9 |  |  | 333.9 | 278.0 |
Metalcasting [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 72.9 |  | 66.3 |  |  | 235.0 | 180.8 |
Environmental Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 39.8 |  | 30.2 |  |  | 105.8 | 104.5 |
Building Materials [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 15.9 |  | 13.5 |  |  | 45.0 | 43.5 |
Paper PCC [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 89.5 |  | 74.5 |  |  | 264.9 | 225.1 |
Specialty PCC [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 18.2 |  | 17.3 |  |  | 57.1 | 49.7 |
Ground Calcium Carbonate [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 25.0 |  | 23.2 |  |  | 74.5 | 66.4 |
Talc [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 14.2 |  | 10.1 |  |  | 40.9 | 30.8 |
Refractory Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 58.3 |  | 48.8 |  |  | 175.1 | 151.7 |
Metallurgical Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 17.6 |  | 10.5 |  |  | 49.2 | 32.5 |
Performance Materials [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 250.4 | $ 219.0 | 203.9 | $ 191.5 | $ 211.4 | 719.7 | 606.8 | $ 825.8
Performance Materials [Member] | Household, Personal Care & Specialty Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 121.8 | 102.2 | 93.9 | 87.9 | 96.2 | 333.9 | 278.0 | 380.2
Performance Materials [Member] | Metalcasting [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 72.9 | 77.3 | 66.3 | 52.8 | 61.7 | 235.0 | 180.8 | 258.1
Performance Materials [Member] | Environmental Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 39.8 | 27.1 | 30.2 | 37.6 | 36.7 | 105.8 | 104.5 | 131.6
Performance Materials [Member] | Building Materials [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 15.9 | $ 12.4 | 13.5 | $ 13.2 | $ 16.8 | 45.0 | 43.5 | $ 55.9
Specialty Minerals [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 146.9 |  | 125.1 |  |  | 437.4 | 372.0 |
Specialty Minerals [Member] | Paper PCC [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 89.5 |  | 74.5 |  |  | 264.9 | 225.1 |
Specialty Minerals [Member] | Specialty PCC [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 18.2 |  | 17.3 |  |  | 57.1 | 49.7 |
Specialty Minerals [Member] | Ground Calcium Carbonate [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 25.0 |  | 23.2 |  |  | 74.5 | 66.4 |
Specialty Minerals [Member] | Talc [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 14.2 |  | 10.1 |  |  | 40.9 | 30.8 |
Refractories [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 75.9 |  | 59.3 |  |  | 224.3 | 184.2 |
Refractories [Member] | Refractory Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | 58.3 |  | 48.8 |  |  | 175.1 | 151.7 |
Refractories [Member] | Metallurgical Products [Member] |  |  |  |  |  |  |  |
Disaggregation of Revenue [Abstract] |  |  |  |  |  |  |  |
Total net sales | $ 17.6 |  | $ 10.5 |  |  | $ 49.2 | $ 32.5 |

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