Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2021

Revenue from Contracts with Customers [Abstract]

Disaggregation of Revenue

The following table disaggregates our revenue by major source (product line) for the years ended December 31, 2021, 2020 and 2019:

	Year Ended December 31,
(millions of dollars)	2021		2020		2019
Net Sales
Household, Personal Care & Specialty Products	$	460.5	$	380.2	$	376.6
Metalcasting		319.2		258.1		291.2
Environmental Products		136.3		131.6		181.8
Building Materials		60.0		55.9		68.9
Performance Materials		976.0		825.8		918.5
Paper PCC		349.7		308.4		364.9
Specialty PCC		77.1		69.3		69.1
Ground Calcium Carbonate		98.1		89.3		91.3
Talc		54.0		43.9		49.1
Specialty Minerals		578.9		510.9		574.4
Refractory Products		237.1		212.3		244.8
Metallurgical Products		66.3		45.8		53.3
Refractories		303.4		258.1		298.1
Total	$	1,858.3	$	1,594.8	$	1,791.0