Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 31, 2019

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, 2019, 2018 and 2017:

	Year Ended December 31,
(millions of dollars)	2019		2018		2017
Net Sales
Metalcasting	$	291.2	$	328.9	$	294.3
Household, Personal Care & Specialty Products		376.6		348.5		294.6
Environmental Products		86.6		80.3		67.7
Building Materials		68.9		70.4		78.2
Performance Materials		823.3		828.1		734.8
Paper PCC		364.9		378.5		377.7
Specialty PCC		69.1		66.9		66.0
Ground Calcium Carbonate		91.3		91.0		87.3
Talc		49.1		52.9		53.8
Specialty Minerals		574.4		589.3		584.8
Refractory Products		244.8		261.1		226.9
Metallurgical Products		53.3		50.8		52.5
Refractories		298.1		311.9		279.4
Energy Services		95.2		78.3		76.7
Total	$	1,791.0	$	1,807.6	$	1,675.7