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Commitments And Contingencies Other Contingencies (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2012
a
Environmental Claims For Site In Goodyear Arizona [Member]        
Loss Contingencies [Line Items]        
Accrual for Environmental Loss Contingencies, Revision in Estimates $ 49.0 $ 18.9    
Accrual for Environmental Loss Contingencies   46.9 $ 39.8  
Accrued Environmental Loss Contingencies, Current   10.9 10.9  
Recorded Third-Party Environmental Recoveries Receivable   $ 9.7 $ 7.8  
Estimated Percentage Of Insurance Which Covers Asbestos Costs   21.00%    
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site [Member]        
Loss Contingencies [Line Items]        
Approximate Size Of Referenced Site | a       55,000
Asbestos Commitments And Contingencies [Member]        
Loss Contingencies [Line Items]        
Estimated Percentage Of Insurance Which Covers Asbestos Costs   14.00%