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Derivative Instruments - Gross Notional Values (Details)
bbl in Millions, $ in Millions
6 Months Ended
Jun. 30, 2020
USD ($)
bbl
Long | Commodity contracts  
Derivative instruments, at their respective fair value positions  
Notional value of commodity contracts (in barrels) | bbl 65.0
Long | Foreign currency contracts | USD  
Derivative instruments, at their respective fair value positions  
Notional value of foreign currency exchange contracts | $ $ 422.6
Short | Commodity contracts  
Derivative instruments, at their respective fair value positions  
Notional value of commodity contracts (in barrels) | bbl 49.2
Short | Foreign currency contracts | USD  
Derivative instruments, at their respective fair value positions  
Notional value of foreign currency exchange contracts | $ $ 70.3