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Revenue from Contracts with Customers
3 Months Ended
Apr. 01, 2018
Revenue from Contracts with Customers [Abstract]  
Revenue from Contracts with Customers
Note 2.  Revenue from Contracts with Customers
 
The Company’s revenues are primarily derived from the sale of products. 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 the Company’s PCC contracts, 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.  The Company also has 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 to the customer.
 
Revenue from sales of equipment, primarily in 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.
 
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 output 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 period ended April 1, 2018 and April 2, 2017:

  
Three Months Ended
 
  
Apr. 1,
2018
  
Apr. 2,
2017
 
  
(millions of dollars)
 
Net Sales
      
Metalcasting
 
$
79.2
  
$
66.6
 
Household, Personal Care and Specialty Products
  
48.7
   
41.1
 
Environmental Products
  
12.7
   
10.6
 
Building Materials
  
18.9
   
17.4
 
Basic Minerals
  
27.8
   
34.2
 
Performance Materials
  
187.3
   
169.9
 
         
Paper PCC
  
97.0
   
93.4
 
Specialty PCC
  
17.0
   
17.0
 
Talc
  
13.1
   
14.3
 
Ground Calcium Carbonate
  
22.5
   
21.5
 
Specialty Minerals
  
149.6
   
146.2
 
         
Refractory Products
  
62.3
   
56.7
 
Metallurgical Products
  
13.0
   
13.5
 
Refractories
  
75.3
   
70.2
 
         
Energy Services
  
19.1
   
18.7
 
         
Total
 
$
431.3
  
$
405.0