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Commitments and Contingencies (Details)
$ in Millions
Jun. 30, 2015
USD ($)
Legal Matters  
Estimated amount recoverable due to theft of fuel product $ 18.0
Derailment of freight train  
Legal Matters  
Liabilities recorded based on estimated losses 158.7
Receivables for portion of liability recoverable from insurance 155.0
Derailment of freight train | Accrued expenses and other current liabilities  
Legal Matters  
Liabilities recorded based on estimated losses 129.8
Derailment of freight train | Other current assets  
Legal Matters  
Receivables for portion of liability recoverable from insurance $ 142.7