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Derivative Financial Instruments - Foreign Exchange Rate Risk (Details)
€ in Millions, $ in Millions
6 Months Ended 32 Months Ended
Jun. 30, 2020
SGD ($)
$ / bbl
bbl
Jun. 30, 2020
SGD ($)
$ / bbl
bbl
Jun. 30, 2020
USD ($)
$ / bbl
Jun. 30, 2020
EUR (€)
$ / bbl
Jun. 30, 2020
JPY (¥)
$ / bbl
Dec. 31, 2019
SGD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
JPY (¥)
Foreign Exchange Forward                
Derivative [Line Items]                
Derivative contract term 18 months              
Options Held                
Derivative [Line Items]                
Derivative, nonmonetary notional amount, volume | bbl 99,909 374,380            
Derivative, average price risk option strike price | $ / bbl 67.29 67.29 67.29 67.29 67.29      
USD | Forward Contracts                
Derivative [Line Items]                
Derivative, notional amount     $ 13,400,000       $ 13,400,000  
USD | Cross Currency Interest Rate Contract                
Derivative [Line Items]                
Derivative, notional amount             90,000,000  
USD | Net Investment Hedges: | Cross Currency Interest Rate Contract                
Derivative [Line Items]                
Derivative, notional amount             $ 90,000,000  
Yen | Cross Currency Interest Rate Contract                
Derivative [Line Items]                
Derivative, notional amount | ¥               ¥ 9,800,000,000
SGD | Forward Contracts                
Derivative [Line Items]                
Derivative, notional amount $ 601.5 $ 601.5       $ 601.5    
Long | Designated as Hedging Instrument | USD | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, notional amount     39,200,000          
Long | Designated as Hedging Instrument | Yen | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, notional amount | ¥         ¥ 6,856,400,000      
Long | Designated as Hedging Instrument | SGD | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, notional amount $ 44.4 $ 44.4            
Short | Designated as Hedging Instrument | USD | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, notional amount     0 € 35.0        
Short | Designated as Hedging Instrument | Yen | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, notional amount     33,800,000 27.1        
Short | Designated as Hedging Instrument | SGD | Foreign Exchange Forward                
Derivative [Line Items]                
Derivative, notional amount     $ 25,900,000 € 5.1