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Commitments and Contingencies (Schedule Of Settlement And Defense Costs) (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
claim
Sep. 30, 2018
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2019
USD ($)
claim
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
claim
Dec. 31, 2016
USD ($)
Mar. 31, 2019
claim
Jun. 30, 2018
claim
Mar. 31, 2018
claim
Loss Contingencies [Line Items]                      
Pre-tax cash payments       $ 29,000,000.0 $ 46,400,000            
Asbestos Commitments and Contingencies                      
Loss Contingencies [Line Items]                      
Estimated Percentage Of Insurance Which Covers Asbestos Costs     21.00%         21.00%      
Asbestos Cumulative Claims Resolved | claim 138,000     138,000              
Loss Contingency, Pending Claims, Number | claim 28,829     28,829   29,089 32,234   28,851 29,323 29,920
Settlement / indemnity costs incurred (1) $ 8,800,000 $ 7,600,000   $ 38,800,000 49,600,000 $ 63,000,000.0          
Defense costs incurred (1) 5,100,000 6,200,000   15,400,000 20,100,000 25,800,000          
Gross Settlement And Defense Incurred Costs 13,900,000 13,800,000   54,200,000 69,700,000 88,800,000          
Settlement / indemnity payments 12,000,000.0 12,000,000.0   27,600,000 46,000,000.0 61,500,000          
Defense payments 5,200,000 5,900,000   15,400,000 17,700,000 26,500,000          
Insurance receipts (6,200,000) (6,300,000)   (14,100,000) (17,300,000) (24,100,000)          
Pre-tax cash payments 11,000,000.0 $ 11,600,000   28,900,000 $ 46,400,000 63,900,000          
Cumulative Related Settlement Cost Incurred Before Insurance Recoveries 640,000,000     640,000,000              
Cumulative Asbestos Settlement Cost Per Resolved Claim 4,600     4,600              
Asbestos Settlement Cost Per Resolved Claim           11,300 $ 7,800 $ 3,900      
Estimated Funds Available From Post Bankruptcy Trusts To Pay Current And Future Claimants           $ 36,000,000,000          
Increase In Total Asbestos Liability     $ 227,000,000                
Mesothelioma Claims Percentage Pending Asbestos Claims     10.00%         10.00%      
Mesothelioma Claims Percentage Aggregate Settlement Defense Costs     90.00%         90.00%      
Insurance Receivable Asbestos $ 77,000,000   $ 143,000,000 $ 77,000,000       $ 143,000,000