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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2022	Jul. 04, 2021	Jul. 03, 2022	Jul. 04, 2021
Disaggregation of Revenue [Abstract]
Net sales	$ 557.0	$ 455.6	$ 1,076.1	$ 908.2
Household, Personal Care & Specialty Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	140.1	102.6	282.6	212.0
Metalcasting [Member]
Disaggregation of Revenue [Abstract]
Net sales	88.8	80.5	169.0	162.2
Environmental Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	54.4	39.9	90.3	65.9
Building Materials [Member]
Disaggregation of Revenue [Abstract]
Net sales	16.3	15.4	29.8	29.2
Paper PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	91.9	85.8	188.7	175.4
Specialty PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	28.0	18.5	52.2	38.9
Ground Calcium Carbonate [Member]
Disaggregation of Revenue [Abstract]
Net sales	28.9	25.5	55.4	49.5
Talc [Member]
Disaggregation of Revenue [Abstract]
Net sales	15.5	12.9	31.1	26.7
Refractory Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	70.2	58.0	135.0	116.8
Metallurgical Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	22.9	16.5	42.0	31.6
Performance Materials [Member]
Disaggregation of Revenue [Abstract]
Net sales	299.6	238.4	571.7	469.3
Performance Materials [Member] | Household, Personal Care & Specialty Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	140.1	102.6	282.6	212.0
Performance Materials [Member] | Metalcasting [Member]
Disaggregation of Revenue [Abstract]
Net sales	88.8	80.5	169.0	162.2
Performance Materials [Member] | Environmental Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	54.4	39.9	90.3	65.9
Performance Materials [Member] | Building Materials [Member]
Disaggregation of Revenue [Abstract]
Net sales	16.3	15.4	29.8	29.2
Specialty Minerals [Member]
Disaggregation of Revenue [Abstract]
Net sales	164.3	142.7	327.4	290.5
Specialty Minerals [Member] | Paper PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	91.9	85.8	188.7	175.4
Specialty Minerals [Member] | Specialty PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	28.0	18.5	52.2	38.9
Specialty Minerals [Member] | Ground Calcium Carbonate [Member]
Disaggregation of Revenue [Abstract]
Net sales	28.9	25.5	55.4	49.5
Specialty Minerals [Member] | Talc [Member]
Disaggregation of Revenue [Abstract]
Net sales	15.5	12.9	31.1	26.7
Refractories [Member]
Disaggregation of Revenue [Abstract]
Net sales	93.1	74.5	177.0	148.4
Refractories [Member] | Refractory Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	70.2	58.0	135.0	116.8
Refractories [Member] | Metallurgical Products [Member]
Disaggregation of Revenue [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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