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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

X

- 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

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- Definition

Represents the expense incurred for the purchase of Renewable Identification Numbers.

+ References

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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
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Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities.

+ References

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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