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Contingencies (Details)
 9 Months Ended
Sep. 30, 2018
USD ($)
site
Loss Contingencies [Line Items]  
Number of Superfund sites for which company may be liable | site 1
Outstanding letters of credit $ 16,100,000
Estimate of possible loss 0
Workers Compensation Insurance Claims  
Loss Contingencies [Line Items]  
Insurance deductible amount 1,000,000
General Liability Insurance Claims  
Loss Contingencies [Line Items]  
Insurance deductible amount 3,000,000
Auto Liability Insurance Claims  
Loss Contingencies [Line Items]  
Insurance deductible amount 300,000
Insurance Claims  
Loss Contingencies [Line Items]  
Loss contingency accrual $ 19,500,000