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Commitments and Contingencies (Other Contingencies) (Detail)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2012
a
Jul. 31, 2006
Loss Contingencies [Line Items]                
Airplane operating lease period, years       7        
Fair Value Of Residual Value Guarantee $ 11.1     $ 11.1        
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold 14.4     14.4        
Payments for airplane       6.7        
Asbestos Commitments and Contingencies                
Loss Contingencies [Line Items]                
Gross Settlement And Defense Incurred Costs 13.8 $ 30.7   69.7 $ 75.5 $ 88.3    
Environmental Claims For A Site In Goodyear Arizona                
Loss Contingencies [Line Items]                
Estimated liability 35.1     35.1        
Amount of additional remediation activities     $ 49.0          
Accrued environmental loss contingencies current 9.4     9.4        
Loss contingency reimbursement rate               21.00%
Other receivables $ 7.7     $ 7.7        
Environmental Claims For Crab Orchard National Wildlife Refuge Superfund Site                
Loss Contingencies [Line Items]                
Approximate size of referenced site, acres | a             55,000