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Commitments and Contingencies (Other Contingencies) (Detail) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2012 a
Asbestos Commitments and Contingencies |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Gross Settlement And Defense Incurred Costs | $ 11.2 | $ 13.8 |  | $ 23.9 | $ 40.3 | $ 66.2 |
Environmental Claims For A Site In Goodyear Arizona |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Revision in Estimates |  |  | $ 49.0 |  |  | $ 18.9 |
Estimated liability | 42.1 |  |  | 42.1 |  |  |
Accrued environmental loss contingencies current | $ 10.9 |  |  | $ 10.9 |  |  |
Loss Contingency Reimbursement Rate | 21.00% |  |  | 21.00% |  |  |
Other receivables | $ 8.7 |  |  | $ 8.7 |  |  |
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Approximate Size Of Referenced Site | a |  |  |  |  |  |  | 55,000

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