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Commitments and Contingencies (Asbestos Liability) (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) claim | Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) claim | Sep. 30, 2021 USD ($) claim | Sep. 30, 2020 USD ($) claim | Dec. 31, 2020 USD ($) claim | Dec. 31, 2019 USD ($) claim | Dec. 31, 2018 USD ($) | Jun. 30, 2021 claim | Jun. 30, 2020 claim | Aug. 21, 2012 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for asbestos-related fees and costs, net of insurance recoveries |  |  |  | $ 29,600,000 | $ 23,700,000 |  |  |  |  |  |
Estimated payments to current and future claimants | $ 36,000,000,000 |  |  | 36,000,000,000 |  |  |  |  |  |  |
Current portion of total estimated liability | $ 66,500,000 |  |  | $ 66,500,000 |  | $ 66,500,000 |  |  |  |  |
Asbestos Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pending claims | claim | 29,926 |  | 29,308 | 29,926 | 29,308 | 29,138 | 29,056 |  | 29,788 | 28,927 |
Gross Settlement And Defense Incurred Costs | $ 14,400,000 | $ 50,900,000 | $ 6,300,000 | $ 35,700,000 | $ 30,200,000 |  |  |  |  |  |
Payments for asbestos-related fees and costs, net of insurance recoveries | $ 9,400,000 | $ 31,100,000 | $ 4,600,000 | $ 29,600,000 | $ 23,700,000 |  |  |  |  |  |
Cumulative claims resolved | claim | 143,000 |  |  | 143,000 |  |  |  |  |  |  |
Settlement cost | $ 703,000,000 |  |  | $ 703,000,000 |  |  |  |  |  |  |
Cumulative Asbestos Settlement Cost Per Resolved Claim | 4,900 |  |  | 4,900 |  |  |  |  |  |  |
Average settlement cost per resolved claim |  |  |  |  |  | $ 13,900 | $ 15,800 | $ 11,300 |  |  |
Additional liability |  |  |  |  |  |  | 255,000,000 |  |  |  |
Liability for claims | 630,000,000 |  |  | 630,000,000 |  | 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 |  | 66,500,000 |  |  |  |  |
Aggregate value of policy buyout agreements | 82,500,000 |  |  | 82,500,000 |  |  |  |  |  |  |
Estimated Percentage Of Insurance Which Covers Asbestos Costs |  |  |  |  |  |  | 14.00% |  |  |  |
Insurance reimbursement asset | $ 77,000,000 |  |  | $ 77,000,000 |  | $ 87,000,000 | $ 98,000,000 |  |  |  |
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 |  |  | 18,000 |  |  |  |  |  |  |
Non-malignancy claims | claim | 16,000 |  |  | 16,000 |  |  |  |  |  |  |

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