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Commitments and Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 USD ($) claim | Jun. 30, 2020 USD ($) claim | Jun. 30, 2021 USD ($) claim | Jun. 30, 2020 USD ($) claim | Dec. 31, 2020 USD ($) claim | Dec. 31, 2019 USD ($) claim | Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Current asbestos liability | $ 66,500,000 |  | $ 66,500,000 |  | $ 66,500,000 |  |
Payments for asbestos-related fees and costs, net of insurance recoveries |  |  | 20,200,000 | $ 19,200,000 |  |  |
Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Asbestos Settlement Cost Per Resolved Claim |  |  | 13,900 |  |  | $ 15,800 | $ 11,300
Current asbestos liability | 66,500,000 |  | 66,500,000 |  | $ 66,500,000 |  |
Aggregate Value Of Policy Buy Out Agreements | $ 82,500,000 |  | $ 82,500,000 |  |  |  |
Beginning claims | claim | 29,407 | 29,162 | 29,138 | 29,056 | 29,056 |  |
New claims | claim | 772 | 577 | 1,505 | 1,258 | 2,620 |  |
Settlements | claim | (176) | (264) | (336) | (429) | (885) |  |
Dismissals | claim | (215) | (548) | (519) | (958) | (1,653) |  |
Ending claims | claim | 29,788 | 28,927 | 29,788 | 28,927 | 29,138 | 29,056 |
Gross Settlement And Defense Incurred Costs | $ 12,200,000 | $ 11,200,000 | $ 21,300,000 | $ 23,900,000 | $ 50,900,000 |  |
Payments for asbestos-related fees and costs, net of insurance recoveries | 9,400,000 | $ 7,400,000 | 20,200,000 | $ 19,200,000 | $ 31,100,000 |  |
Cumulative Asbestos Settlement Cost Per Resolved Claim | $ 4,900 |  | $ 4,900 |  |  |  |
New York | Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Ending claims | claim | 18,000 |  | 18,000 |  |  |  |
us-gaap_LossContingencyPendingClaimsNumber (nonmalignancy) | claim | 16,000 |  | 16,000 |  |  |  |

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- Definition Estimated liability anticipated to be paid to settle asbestos claims and related litigation costs within one year. + References No definition available. + Details
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