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Revenues (Tables)
6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue The following table presents our Net sales disaggregated by product line.
 Three Months Ended June 30,Six Months Ended June 30,
In millions2020201920202019
Automotive Technologies product line$74.7  $113.9  $187.6  $213.6  
Process Purification product line9.7  9.2  17.9  18.6  
Performance Materials segment$84.4  $123.1  $205.5  $232.2  
Oilfield Technologies product line14.2  29.7  44.4  58.9  
Pavement Technologies product line63.9  64.6  84.6  83.1  
Industrial Specialties product line76.5  101.1  156.4  196.9  
Engineered Polymers product line(1)
31.6  34.3  67.9  58.5  
Performance Chemicals segment$186.2  $229.7  $353.3  $397.4  
Net sales$270.6  $352.8  $558.8  $629.6  
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(1) Engineered Polymers product line was acquired on February 13, 2019; see Note 4 for more information.
        
The following table presents our Net sales disaggregated by geography, based on the delivery address of our customer.
Three Months Ended June 30,Six Months Ended June 30,
In millions2020201920202019
North America$147.3  $227.2  $318.4  $398.9  
Asia Pacific82.6  67.8  150.5  116.9  
Europe, Middle East and Africa37.1  52.6  80.5  103.8  
South America3.6  5.2  9.4  10.0  
Net sales$270.6  $352.8  $558.8  $629.6  
Contract with Customer, Asset and Liability The following table provides information about contract assets and contract liabilities from contracts with customers. The contract assets primarily relate to our rights to consideration for products produced but not billed at the reporting date on contracts with certain customers. The contract assets are recognized as accounts receivables when the rights become unconditional and the customer has been billed. Contract liabilities represent obligations to transfer goods to a customer for which we have received consideration from our customer. For all periods presented we had no contract liabilities.
Contract Asset(1)
In millionsJune 30, 2020June 30, 2019
Beginning balance$6.2  $5.1  
Contract asset additions7.9  11.7  
Reclassification to accounts receivable, billed to customers(7.6) (10.5) 
Ending balance$6.5  $6.3  
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(1) Included within "Prepaid and other current assets" on the condensed consolidated balance sheet.