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Derivatives - Gross Notional Values (Details)
bbl in Millions, $ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
bbl
Long | Commodity contracts  
Derivative instruments, at their respective fair value positions  
Notional value of commodity contracts (in barrels) | bbl 78.3
Long | Foreign currency contracts | USD  
Derivative instruments, at their respective fair value positions  
Notional amount of foreign currency contracts | $ $ 424.3
Short | Commodity contracts  
Derivative instruments, at their respective fair value positions  
Notional value of commodity contracts (in barrels) | bbl 83.7
Short | Foreign currency contracts | USD  
Derivative instruments, at their respective fair value positions  
Notional amount of foreign currency contracts | $ $ 287.9