Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020, 2019 and 2018:

	Year Ended December 31,
(millions of dollars)	2020		2019		2018
Net Sales
Metalcasting	$	258.1	$	291.2	$	328.9
Household, Personal Care & Specialty Products		380.2		376.6		348.5
Environmental Products		58.6		86.6		80.3
Building Materials		55.9		68.9		70.4
Performance Materials		752.8		823.3		828.1
Paper PCC		308.4		364.9		378.5
Specialty PCC		69.3		69.1		66.9
Ground Calcium Carbonate		89.3		91.3		91.0
Talc		43.9		49.1		52.9
Specialty Minerals		510.9		574.4		589.3
Refractory Products		212.3		244.8		261.1
Metallurgical Products		45.8		53.3		50.8
Refractories		258.1		298.1		311.9
Energy Services		73.0		95.2		78.3
Total	$	1,594.8	$	1,791.0	$	1,807.6