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Asbestos-Related Liabilities (Tables) | 12 Months Ended
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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:
| 2020 |  | 2019 |  | 2018
Beginning claims | 56,000 |  |  | 56,000 |  |  | 55,500 |
New claims | 1,500 |  |  | 2,000 |  |  | 2,000 |
Settlements or dismissals | (1,500) |  |  | (2,000) |  |  | (1,500) |
Ending claims | 56,000 |  |  | 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:
| 2020 |  | 2019
Claimants alleging first exposure after 1964 | 16,500 |  |  | 16,500 |
Claimants alleging first exposure before or during 1964 filed in: |  |  |
Texas | 13,000 |  |  | 13,000 |
Pennsylvania | 1,500 |  |  | 1,500 |
Other states that have enacted asbestos legislation | 6,000 |  |  | 6,000 |
Other states | 19,000 |  |  | 19,000 |
Total claims outstanding | 56,000 |  |  | 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:
| 2020 |  | 2019 |  | 2018
Total claims | 23 | % |  | 22 | % |  | 22 | %
Pre-1964 claims in states without asbestos legislation | 41 | % |  | 41 | % |  | 41 | %

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