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Commitments and Contingencies - Environmental, Health and Safety Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jul. 25, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |
Environmental costs recognized capitalized in the period | $ 2.6 | $ 7.4 | $ 6.1 | $ 18.3 |  |
EHS |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Environmental accruals | 5.6 |  | 5.6 |  |  | $ 3.6
EHS | CRRM |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Cost of renewable identification numbers | 51.0 | $ 37.5 | 94.1 | $ 74.1 |  |
Biofuel blending obligation recorded in other current liabilities | $ 50.7 |  | $ 50.7 |  |  | $ 9.5
EHS | Subsequent Event |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Preliminary assessed civil penalty |  |  |  |  | $ 0.5 |

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- Definition Carrying value as of the balance sheet date of obligations pertains to Biofuels blending. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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- Definition Represents the expense incurred for the purchase of Renewable Identification Numbers. + References No definition available. + Details
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 + Details
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