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Commitments and Contingencies (Other Contingencies) (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2012
a
Asbestos Commitments and Contingencies            
Loss Contingencies [Line Items]            
Gross Settlement And Defense Incurred Costs $ 12.6   $ 26.5   $ 66.2  
Environmental Claims For A Site In Goodyear Arizona            
Loss Contingencies [Line Items]            
Accrual for Environmental Loss Contingencies, Revision in Estimates   $ 18.9   $ 49.0    
Estimated liability 44.2          
Accrued environmental loss contingencies current $ 10.9          
Loss Contingency Reimbursement Rate 21.00%          
Other receivables $ 9.7          
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site            
Loss Contingencies [Line Items]            
Approximate Size Of Referenced Site | a           55,000