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financial instruments - Currency risk (Details) - U.S. Dollars	12 Months Ended
	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%

X

- 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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X

- 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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X

- Details

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X

- Details

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