Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2019

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 30, 2019 and July 1, 2018 :

(millions of dollars)	Three Months Ended				Six Months Ended
Net Sales	June 30, 2019		July 1, 2018		June 30, 2019		July 1, 2018
Metalcasting	$	75.8	$	88.8	$	149.0	$	168.0
Household, Personal Care and Specialty Products		69.0		58.6		143.9		107.3
Environmental Products		29.0		25.2		44.9		37.9
Building Materials		19.1		18.0		34.4		36.9
Basic Minerals		22.5		23.9		42.4		51.7
Performance Materials		215.4		214.5		414.6		401.8
Paper PCC		90.2		94.5		181.7		191.5
Specialty PCC		17.3		17.3		35.4		34.3
Ground Calcium Carbonate		24.8		25.2		47.1		47.7
Talc		12.8		13.9		25.3		27.0
Specialty Minerals		145.1		150.9		289.5		300.5
Refractory Products		61.0		66.7		123.0		129.0
Metallurgical Products		16.5		12.9		28.3		25.9
Refractories		77.5		79.6		151.3		154.9
Energy Services		25.8		19.7		46.1		38.8
Total	$	463.8	$	464.7	$	901.5	$	896.0