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Segment and Related Information, Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022 USD ($)	Jul. 04, 2021 USD ($)	Jul. 03, 2022 USD ($) Segment	Jul. 04, 2021 USD ($)
Segment and Related Information [Abstract]
Number of reportable segments | Segment			3
Net sales	$ 557.0	$ 455.6	$ 1,076.1	$ 908.2
Income from operations	69.4	63.7	135.6	122.5
Performance Materials [Member]
Segment and Related Information [Abstract]
Net sales	299.6	238.4	571.7	469.3
Specialty Minerals [Member]
Segment and Related Information [Abstract]
Net sales	164.3	142.7	327.4	290.5
Refractories [Member]
Segment and Related Information [Abstract]
Net sales	93.1	74.5	177.0	148.4
Reportable Segments [Member]
Segment and Related Information [Abstract]
Net sales	557.0	455.6	1,076.1	908.2
Income from operations	73.3	66.4	141.9	129.3
Reportable Segments [Member] | Performance Materials [Member]
Segment and Related Information [Abstract]
Net sales	299.6	238.4	571.7	469.3
Income from operations	36.9	34.7	70.6	64.5
Reportable Segments [Member] | Specialty Minerals [Member]
Segment and Related Information [Abstract]
Net sales	164.3	142.7	327.4	290.5
Income from operations	20.2	20.0	38.6	41.1
Reportable Segments [Member] | Refractories [Member]
Segment and Related Information [Abstract]
Net sales	93.1	74.5	177.0	148.4
Income from operations	$ 16.2	$ 11.7	$ 32.7	$ 23.7

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