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Commitments and Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) claim | Mar. 31, 2020 USD ($) 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 |  |
Payments for asbestos-related fees and costs, net of insurance recoveries | 10,800,000 | $ 11,700,000 |  |  |
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 |  |
Aggregate Value Of Policy Buy Out Agreements | $ 82,500,000 |  |  |  |
Beginning claims | claim | 29,138 | 29,056 | 29,056 |  |
New claims | claim | 733 | 681 | 2,620 |  |
Settlements | claim | (160) | (165) | (885) |  |
Dismissals | claim | (304) | (410) | (1,653) |  |
Ending claims | claim | 29,407 | 29,162 | 29,138 | 29,056 |
Gross Settlement And Defense Incurred Costs | $ 9,100,000 | $ 12,600,000 | $ 50,900,000 |  |
Payments for asbestos-related fees and costs, net of insurance recoveries | 10,800,000 | $ 11,700,000 | $ 31,100,000 |  |
Cumulative Asbestos Settlement Cost Per Resolved Claim | $ 4,800 |  |  |  |
New York | Asbestos Commitments and Contingencies |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Ending claims | claim | 18,000 |  |  |  |
us-gaap_LossContingencyPendingClaimsNumber (nonmalignancy) | claim | 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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