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Commitments and Contingencies (Asbestos Liability) (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 ($) | Aug. 21, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Payments for asbestos-related fees and costs, net of insurance recoveries | $ 10,800,000 | $ 11,700,000 |  |  |  |
Estimated payments to current and future claimants | 36,000,000,000 |  |  |  |  |
Current portion of total estimated liability | $ 66,500,000 |  | $ 66,500,000 |  |  |
Asbestos Commitments and Contingencies |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Pending claims | claim | 29,407 | 29,162 | 29,138 | 29,056 |  |
Payments for asbestos-related fees and costs, net of insurance recoveries | $ 10,800,000 | $ 11,700,000 | $ 31,100,000 |  |  |
Cumulative claims resolved | claim | 142,000 |  |  |  |  |
Settlement cost | $ 684,000,000 |  |  |  |  |
Average settlement cost per resolved claim |  |  | 13,900 | $ 15,800 | $ 11,300 |
Additional liability |  |  |  | 255,000,000 |  |
Liability for claims | 657,000,000 |  | 670,000,000 | $ 712,000,000 |  |
Percentage Of Asbestos Liability Attributable To Settlement And Defense Costs For Future Claims |  |  |  | 85.00% |  |
Current portion of total estimated liability | 66,500,000 |  | 66,500,000 |  |  |
Aggregate value of policy buyout agreements | 82,500,000 |  |  |  |  |
Estimated Percentage Of Insurance Which Covers Asbestos Costs |  |  |  | 14.00% |  |
Insurance reimbursement asset | 84,000,000 |  | 87,000,000 | $ 98,000,000 |  |
Gross Settlement And Defense Incurred Costs | $ 9,100,000 | $ 12,600,000 | $ 50,900,000 |  |  |
Asbestos Commitments and Contingencies | Ronald Dummitt |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Court Judgment |  |  |  |  |  | $ 4,900,000
New York | Asbestos Commitments and Contingencies |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Pending claims | claim | 18,000 |  |  |  |  |

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