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v3.21.2

Commitments and Contingencies (Other Contingencies) (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 21, 2021 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2012 a
Goodyear Site |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Proceeds from sale of property | $ 8.7 |  |  |  |  |
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 |  |  |  | $ 35.5 | $ 39.8 |
Accrued environmental loss contingencies current |  |  |  | $ 10.9 | 10.9 |
Loss Contingency Reimbursement Rate |  |  |  | 21.00% |  |
Other receivables |  |  |  | $ 7.3 | $ 7.8 |
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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