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v3.20.2

Segment and Related Information, Sales By Product Category (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Revenue from External Customer [Abstract] |  |  |  |
Net sales | $ 357.2 | $ 463.8 | $ 774.7 | $ 901.5
Performance Materials [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 173.8 | 215.4 | 360.0 | 414.6
Specialty Minerals [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 109.8 | 145.1 | 246.9 | 289.5
Refractories [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 55.9 | 77.5 | 124.9 | 151.3
Energy Services [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 17.7 | 25.8 | 42.9 | 46.1
Metalcasting [Member] | Performance Materials [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 52.8 | 75.8 | 114.5 | 149.0
Household, Personal Care & Specialty Products [Member] | Performance Materials [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 87.9 | 91.5 | 184.1 | 186.3
Environmental Products [Member] | Performance Materials [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 19.9 | 29.0 | 31.4 | 44.9
Building Materials [Member] | Performance Materials [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 13.2 | 19.1 | 30.0 | 34.4
Paper PCC [Member] | Specialty Minerals [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 65.5 | 90.2 | 150.6 | 181.7
Specialty PCC [Member] | Specialty Minerals [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 14.9 | 17.3 | 32.4 | 35.4
Ground Calcium Carbonate [Member] | Specialty Minerals [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 20.6 | 24.8 | 43.2 | 47.1
Talc [Member] | Specialty Minerals [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 8.8 | 12.8 | 20.7 | 25.3
Refractory Products [Member] | Refractories [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | 47.1 | 61.0 | 102.9 | 123.0
Metallurgical Products [Member] | Refractories [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net sales | $ 8.8 | $ 16.5 | $ 22.0 | $ 28.3

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