Revenue from Contracts with Customers

12 Months Ended

Dec. 31, 2020

Revenue from Contracts with Customers [Abstract]

Revenue from Contracts with Customers

Note 4.  Revenue from Contracts with Customers

The Company’s revenues are primarily derived from the sale of products in product lines within our Performance Materials, Specialty Minerals, Refractories and Energy Services businesses.  Our primary performance obligation (the sale of products) is satisfied upon shipment or delivery to our customers based on written sales terms, which is also when control is transferred.  In most of our contracts in our Paper PCC product line, which is in our Specialty Minerals segment, the price per ton is based upon the total number of tons sold to the customer during the year.  Under these contracts, the price billed to the customer for shipments during the year is based on periodic estimates of the total annual volume that will be sold to such customer.  Revenues are adjusted at the end of each year to reflect the actual volume sold.

Revenue from sales of equipment, primarily in our Refractory products product line within our Refractories segment, is recorded upon completion of installation and control is transferred to the customer.  Revenue from services is recorded when the services have been performed.  Included within our Refractory products product line are certain consignment arrangements with certain customers in our Refractories segment.  Revenues for these transactions are recorded when the consigned products are consumed by the customer and control is transferred.

Revenue from long-term construction, primarily in our Energy Services segment, where our performance obligations are satisfied in phases, is recognized over time using certain input measures based on the measurement of the value transferred to the customer, including milestones achieved.

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