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Segment and Related Information, Sales By Product Category (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | $ 464.1 | $ 424.4 | $ 1,360.1 | $ 1,243.5
Metalcasting [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 77.8 | 73.6 | 245.8 | 215.9
Household, Personal Care and Specialty Products [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 71.9 | 42.5 | 179.2 | 123.3
Environmental Products [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 26.3 | 21.6 | 64.2 | 51.8
Building Materials [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 18.0 | 19.9 | 54.9 | 57.5
Basic Minerals [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 25.5 | 31.2 | 77.2 | 90.5
Paper PCC [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 93.1 | 96.3 | 284.6 | 282.0
Specialty PCC [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 16.9 | 16.4 | 51.2 | 50.8
Ground Calcium Carbonate [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 23.0 | 22.3 | 70.7 | 67.1
Talc [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 13.3 | 12.7 | 40.3 | 41.0
Refractory Products [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 66.7 | 56.6 | 195.7 | 169.4
Metallurgical Products [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | 12.4 | 12.3 | 38.3 | 38.6
Energy Services [Member] |  |  |  |
Revenue from External Customer [Abstract] |  |  |  |
Net Sales | $ 19.2 | $ 19.0 | $ 58.0 | $ 55.6

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