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Derivatives - Gross Notional Values (Details) bbl in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) bbl
Long | Commodity contracts
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts (in barrels) | bbl	67.4
Long | Foreign currency contracts | USD
Derivative instruments, at their respective fair value positions
Notional amount of foreign currency contracts | $	$ 526.7
Short | Commodity contracts
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts (in barrels) | bbl	79.3
Short | Foreign currency contracts | USD
Derivative instruments, at their respective fair value positions
Notional amount of foreign currency contracts | $	$ 266.4

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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