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Commitments And Contingencies (Other Contingencies) (Details)
a in Thousands, $ in Millions
3 Months Ended
Sep. 30, 2014
USD ($)
Dec. 31, 2017
USD ($)
a
Jul. 31, 2006
Goodyear Site [Member]      
Loss Contingencies [Line Items]      
Environmental Remediation Expense $ 49.0    
Accrual for Environmental Loss Contingencies   $ 41.2  
Accrual for Environmental Loss Contingencies, Gross, Current   9.4  
Remediation, Qualifying Costs Reimbursable, Percent     21.00%
Recorded Third-Party Environmental Recoveries Receivable   $ 9.0  
Crab Orchard Site [Member]      
Loss Contingencies [Line Items]      
Site Contingency, Area Of Site | a   55