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Commitments and Contingencies - Other Liabilities and Matters (Details) $ in Millions | Dec. 31, 2015 USD ($) | Jul. 06, 2013 bbl
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Legal Matters |  |
Estimated amount recoverable due to theft of fuel product | $ 18.0 |
Derailment of freight train |  |
Legal Matters |  |
Volume of crude oil (in barrels) | bbl |  | 50,000
Contribution to compensation fund | $ 110.0 |
DPM |  |
Legal Matters |  |
Previous membership interest in joint venture (as a percent) | 50.00% |
DPTS |  |
Legal Matters |  |
Previous membership interest in joint venture (as a percent) | 50.00% |

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