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Segment and Related Information, Sales by Product Category (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment and Related Information [Abstract]
Net sales	$ 1,858.3	$ 1,594.8	$ 1,791.0
Household, Personal Care & Specialty Products [Member]
Segment and Related Information [Abstract]
Net sales	460.5	380.2	376.6
Metalcasting [Member]
Segment and Related Information [Abstract]
Net sales	319.2	258.1	291.2
Environmental Products [Member]
Segment and Related Information [Abstract]
Net sales	136.3	131.6	181.8
Building Materials [Member]
Segment and Related Information [Abstract]
Net sales	60.0	55.9	68.9
Paper PCC [Member]
Segment and Related Information [Abstract]
Net sales	349.7	308.4	364.9
Specialty PCC [Member]
Segment and Related Information [Abstract]
Net sales	77.1	69.3	69.1
Ground Calcium Carbonate [Member]
Segment and Related Information [Abstract]
Net sales	98.1	89.3	91.3
Talc [Member]
Segment and Related Information [Abstract]
Net sales	54.0	43.9	49.1
Refractory Products [Member]
Segment and Related Information [Abstract]
Net sales	237.1	212.3	244.8
Metallurgical Products [Member]
Segment and Related Information [Abstract]
Net sales	$ 66.3	$ 45.8	$ 53.3

X

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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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