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Contingencies and restrictions (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of contingent liabilities [abstract]
Leverage	0.50	0.32

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- References

No definition available.

+ Details

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- Definition

This is a measurement of leverage, calculated as a company's interest-bearing liabilities minus cash or cash equivalents.

+ References

No definition available.

+ Details

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Period Type:	duration