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v3.19.3.a.u2

Segment and Related Information, Sales by Product Category (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 440.2 | $ 449.3 | $ 463.8 | $ 437.7 | $ 447.5 | $ 464.1 | $ 464.7 | $ 431.3 | $ 1,791.0 | $ 1,807.6 | $ 1,675.7
Metalcasting [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 291.2 | 328.9 | 294.3
Household, Personal Care & Specialty Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 376.6 | 348.5 | 294.6
Environmental Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 86.6 | 80.3 | 67.7
Building Materials [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 68.9 | 70.4 | 78.2
Paper PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 364.9 | 378.5 | 377.7
Specialty PCC [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 69.1 | 66.9 | 66.0
Ground Calcium Carbonate [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 91.3 | 91.0 | 87.3
Talc [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 49.1 | 52.9 | 53.8
Refractory Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 244.8 | 261.1 | 226.9
Metallurgical Products [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 53.3 | 50.8 | 52.5
Energy Services [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 95.2 | $ 78.3 | $ 76.7

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