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financial instruments - Currency risk (Details) - U.S. Dollars | 12 Months Ended
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Dec. 31, 2018
Minimum |
Currency risk |
Exposure to exchange rate fluctuations that is hedged (as a percent) | 50.00%
Maximum |
Currency risk |
Exposure to exchange rate fluctuations that is hedged (as a percent) | 75.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The percentage of exposure to exchange rate fluctuations that is hedged as part of the exchange rate risk management efforts using foreign currency forward contracts and currency options. + References No definition available. + Details
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- Details
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- Details
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- Details
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