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Commitments and Contingencies - Environmental, Health and Safety Matters (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Loss Contingencies [Line Items] |  |  |  |  |
Environmental expenditures capitalized | $ 2.3 | $ 2.6 | $ 7.0 | $ 6.1 |
EHS |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Environmental accruals | 4.3 |  | 4.3 |  | $ 4.8
EHS | CRRM |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Cost of renewable identification numbers expense | 105.6 | $ 51.0 | 99.2 | $ 94.1 |
Biofuel blending obligation recorded in other current liabilities | $ 279.9 |  | $ 279.9 |  | $ 186.3

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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=82911808&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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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 25 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=39739230&loc=d3e11660-110855 + Details
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