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Asbestos-Related Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Liability for Asbestos and Environmental Claims [Abstract]  
Summary of Claims Activity
The Company's approximate claims activity for the years ended 2020, 2019 and 2018 was as follows:
202020192018
Beginning claims56,000 56,000 55,500 
New claims1,500 2,000 2,000 
Settlements or dismissals(1,500)(2,000)(1,500)
Ending claims56,000 56,000 56,000 
Summary of Outstanding Asbestos Claims by Year of Exposure and State Filed
In the fourth quarter of each year, the Company performs an analysis of outstanding claims and categorizes by year of exposure and state filed. As of December 31, 2020 and December 31, 2019, the Company's outstanding claims were:
20202019
Claimants alleging first exposure after 196416,500 16,500 
Claimants alleging first exposure before or during 1964 filed in:
Texas13,000 13,000 
Pennsylvania1,500 1,500 
Other states that have enacted asbestos legislation6,000 6,000 
Other states19,000 19,000 
Total claims outstanding56,000 56,000 
Summary of Percentage of Outstanding Claims Related to Claimants Alleging Serious Diseases
As of December 31, the percentage of outstanding claims related to claimants alleging serious diseases (primarily mesothelioma and other malignancies) were as follows:
202020192018
Total claims23 %22 %22 %
Pre-1964 claims in states without asbestos legislation41 %41 %41 %