Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 28, 2020

Revenue from Contracts with Customers [Abstract]

Disaggregation of Revenue

The following table disaggregates our revenue by major source (product line) for the three and six-month periods ended June 28, 2020 and June 30, 2019 :

(millions of dollars)	Three Months Ended				Six Months Ended
Net Sales	Jun. 28, 2020		Jun. 30, 2019		Jun. 28, 2020		Jun. 30, 2019
Metalcasting	$	52.8	$	75.8	$	114.5	$	149.0
Household, Personal Care & Specialty Products		87.9		91.5		184.1		186.3
Environmental Products		19.9		29.0		31.4		44.9
Building Materials		13.2		19.1		30.0		34.4
Performance Materials		173.8		215.4		360.0		414.6
Paper PCC		65.5		90.2		150.6		181.7
Specialty PCC		14.9		17.3		32.4		35.4
Ground Calcium Carbonate		20.6		24.8		43.2		47.1
Talc		8.8		12.8		20.7		25.3
Specialty Minerals		109.8		145.1		246.9		289.5
Refractory Products		47.1		61.0		102.9		123.0
Metallurgical Products		8.8		16.5		22.0		28.3
Refractories		55.9		77.5		124.9		151.3
Energy Services		17.7		25.8		42.9		46.1
Total	$	357.2	$	463.8	$	774.7	$	901.5