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Asbestos-Related Liabilities - Summary of Outstanding Claims by Year of Exposure and State Filed (Details) - Claim | Sep. 30, 2021 | Dec. 31, 2020
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Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Claims outstanding | 56,900 | 56,000
Asbestos After 1964 |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Claims outstanding |  | 16,500
Texas | Asbestos Before Or During 1964 |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Claims outstanding |  | 13,000
Pennsylvania | Asbestos Before Or During 1964 |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Claims outstanding |  | 1,500
Other states that have enacted asbestos legislation | Asbestos Before Or During 1964 |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Claims outstanding |  | 6,000
Other states | Asbestos Before Or During 1964 |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Claims outstanding |  | 19,000

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