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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