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Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Abstract]
Net sales	$ 1,858.3	$ 1,594.8	$ 1,791.0
Household, Personal Care and Specialty Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	460.5	380.2	376.6
Metalcasting [Member]
Disaggregation of Revenue [Abstract]
Net sales	319.2	258.1	291.2
Environmental Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	136.3	131.6	181.8
Building Materials [Member]
Disaggregation of Revenue [Abstract]
Net sales	60.0	55.9	68.9
Paper PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	349.7	308.4	364.9
Specialty PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	77.1	69.3	69.1
Ground Calcium Carbonate [Member]
Disaggregation of Revenue [Abstract]
Net sales	98.1	89.3	91.3
Talc [Member]
Disaggregation of Revenue [Abstract]
Net sales	54.0	43.9	49.1
Refractory Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	237.1	212.3	244.8
Metallurgical Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	66.3	45.8	53.3
Performance Materials [Member]
Disaggregation of Revenue [Abstract]
Net sales	976.0	825.8	918.5
Performance Materials [Member] | Household, Personal Care and Specialty Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	460.5	380.2	376.6
Performance Materials [Member] | Metalcasting [Member]
Disaggregation of Revenue [Abstract]
Net sales	319.2	258.1	291.2
Performance Materials [Member] | Environmental Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	136.3	131.6	181.8
Performance Materials [Member] | Building Materials [Member]
Disaggregation of Revenue [Abstract]
Net sales	60.0	55.9	68.9
Specialty Minerals [Member]
Disaggregation of Revenue [Abstract]
Net sales	578.9	510.9	574.4
Specialty Minerals [Member] | Paper PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	349.7	308.4	364.9
Specialty Minerals [Member] | Specialty PCC [Member]
Disaggregation of Revenue [Abstract]
Net sales	77.1	69.3	69.1
Specialty Minerals [Member] | Ground Calcium Carbonate [Member]
Disaggregation of Revenue [Abstract]
Net sales	98.1	89.3	91.3
Specialty Minerals [Member] | Talc [Member]
Disaggregation of Revenue [Abstract]
Net sales	54.0	43.9	49.1
Refractories [Member]
Disaggregation of Revenue [Abstract]
Net sales	303.4	258.1	298.1
Refractories [Member] | Refractory Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	237.1	212.3	244.8
Refractories [Member] | Metallurgical Products [Member]
Disaggregation of Revenue [Abstract]
Net sales	$ 66.3	$ 45.8	$ 53.3

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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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