Segment and Related Information, Segment Information (Details) $ in Millions	3 Months Ended
	Apr. 03, 2022 USD ($) Segment	Apr. 04, 2021 USD ($)
Segment and Related Information [Abstract]
Number of reportable segments | Segment	3
Net sales	$ 519.1	$ 452.6
Income from operations	66.2	58.8
Performance Materials [Member]
Segment and Related Information [Abstract]
Net sales	272.1	230.9
Specialty Minerals [Member]
Segment and Related Information [Abstract]
Net sales	163.1	147.8
Refractories [Member]
Segment and Related Information [Abstract]
Net sales	83.9	73.9
Reportable Segments [Member]
Segment and Related Information [Abstract]
Net sales	519.1	452.6
Income from operations	68.6	62.9
Reportable Segments [Member] | Performance Materials [Member]
Segment and Related Information [Abstract]
Net sales	272.1	230.9
Income from operations	33.7	29.8
Reportable Segments [Member] | Specialty Minerals [Member]
Segment and Related Information [Abstract]
Net sales	163.1	147.8
Income from operations	18.4	21.1
Reportable Segments [Member] | Refractories [Member]
Segment and Related Information [Abstract]
Net sales	83.9	73.9
Income from operations	$ 16.5	$ 12.0