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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 |  |  |  |

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