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Commitments and Contingencies (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Oct. 04, 2017
facility
Loss Contingencies [Line Items]            
Liabilities recognized for estimated environmental costs $ 17.1   $ 17.1   $ 20.5  
Environmental expenses 1.4 $ 2.8 3.4 $ 5.3    
Receivables from insurance carriers related to environmental matters 2.8   2.8   4.1  
Accounts Receivable [Member]            
Loss Contingencies [Line Items]            
Receivables from insurance carriers related to environmental matters 1.0   1.0   2.4  
Other Noncurrent Assets [Member]            
Loss Contingencies [Line Items]            
Receivables from insurance carriers related to environmental matters $ 1.8   $ 1.8   $ 1.7  
Powder Springs Logistics, LLC [Member]            
Loss Contingencies [Line Items]            
Interest in equity method investment 50.00%   50.00%      
Powder Springs Logistics, LLC [Member] | Guarantee of Indebtedness of Others [Member] | Equity Method Investee [Member]            
Loss Contingencies [Line Items]            
Interest in equity method investment 50.00%   50.00%      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 25.0   $ 25.0      
Guarantees, Fair Value Disclosure $ 0.4   $ 0.4      
Pending Litigation [Member] | Unfavorable Regulatory Action [Member]            
Loss Contingencies [Line Items]            
Loss Contingency, Alleged Patent Infringement, Number Of Facilities | facility           9