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Segment and Related Information, Reportable Segments (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Oct. 01, 2017 USD ($) | Sep. 30, 2018 USD ($) Segment | Oct. 01, 2017 USD ($)
Segment Reporting Information [Abstract] |  |  |  |
Number of reportable segments | Segment |  |  | 4 |
Net Sales | $ 464.1 | $ 424.4 | $ 1,360.1 | $ 1,243.5
Income from Operations | 68.2 | 67.2 | 193.6 | 198.3
Performance Materials [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 219.5 | 188.8 | 621.3 | 539.0
Specialty Minerals [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 146.3 | 147.7 | 446.8 | 440.9
Refractories [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 79.1 | 68.9 | 234.0 | 208.0
Energy Services [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 19.2 | 19.0 | 58.0 | 55.6
Reportable Segments [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 464.1 | 424.4 | 1,360.1 | 1,243.5
Income from Operations | 69.4 | 69.4 | 199.7 | 203.9
Reportable Segments [Member] | Performance Materials [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 219.5 | 188.8 | 621.3 | 539.0
Income from Operations | 31.8 | 30.6 | 87.6 | 91.6
Reportable Segments [Member] | Specialty Minerals [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 146.3 | 147.7 | 446.8 | 440.9
Income from Operations | 25.0 | 26.6 | 74.2 | 77.9
Reportable Segments [Member] | Refractories [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 79.1 | 68.9 | 234.0 | 208.0
Income from Operations | 11.5 | 9.9 | 34.6 | 29.6
Reportable Segments [Member] | Energy Services [Member] |  |  |  |
Segment Reporting Information [Abstract] |  |  |  |
Net Sales | 19.2 | 19.0 | 58.0 | 55.6
Income from Operations | $ 1.1 | $ 2.3 | $ 3.3 | $ 4.8

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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