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Segment and Related Information, Sales By Product Category (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Segment and Related Information [Abstract]
Net sales	$ 557.0	$ 455.6	$ 1,076.1	$ 908.2
Household, Personal Care & Specialty Products [Member]
Segment and Related Information [Abstract]
Net sales	140.1	102.6	282.6	212.0
Metalcasting [Member]
Segment and Related Information [Abstract]
Net sales	88.8	80.5	169.0	162.2
Environmental Products [Member]
Segment and Related Information [Abstract]
Net sales	54.4	39.9	90.3	65.9
Building Materials [Member]
Segment and Related Information [Abstract]
Net sales	16.3	15.4	29.8	29.2
Paper PCC [Member]
Segment and Related Information [Abstract]
Net sales	91.9	85.8	188.7	175.4
Specialty PCC [Member]
Segment and Related Information [Abstract]
Net sales	28.0	18.5	52.2	38.9
Ground Calcium Carbonate [Member]
Segment and Related Information [Abstract]
Net sales	28.9	25.5	55.4	49.5
Talc [Member]
Segment and Related Information [Abstract]
Net sales	15.5	12.9	31.1	26.7
Refractory Products [Member]
Segment and Related Information [Abstract]
Net sales	70.2	58.0	135.0	116.8
Metallurgical Products [Member]
Segment and Related Information [Abstract]
Net sales	$ 22.9	$ 16.5	$ 42.0	$ 31.6

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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