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Commitments And Contingencies (Other Contingencies Narrative) (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 21, 2021 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 USD ($) a | Dec. 31, 2020 USD ($)
Environmental Claims For Site In Goodyear Arizona |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrual for environmental loss contingencies, revision in estimates |  | $ 49.0 | $ 18.9 |  |
Accrual for environmental loss contingencies |  |  |  | $ 32.3 | $ 39.8
Accrued environmental loss contingencies, current |  |  |  | $ 7.1 | 10.9
Loss contingency reimbursement rate |  |  |  | 21.00% |
Recorded third-party environmental recoveries receivable |  |  |  | $ 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 |
Goodyear Site |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Proceeds from sale of other real estate | $ 8.7 |  |  |  |

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