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Asbestos-Related Liabilities (Summary of Outstanding Claims by Year Of Exposure and State Filed) (Details) - Claim | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Claims outstanding | 56,000 | 56,000 | 56,000 | 55,500
Claimants alleging first exposure after 1964 |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Claims outstanding | 16,500 | 16,500 |  |
Claimants alleging first exposure before or during 1964 | Texas |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Claims outstanding | 13,000 | 13,000 |  |
Claimants alleging first exposure before or during 1964 | Pennsylvania |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Claims outstanding | 1,500 | 1,500 |  |
Claimants alleging first exposure before or during 1964 | Other states that have enacted asbestos legislation |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Claims outstanding | 6,000 | 6,000 |  |
Claimants alleging first exposure before or during 1964 | Other states |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Claims outstanding | 19,000 | 19,000 |  |

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