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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
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