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Financial risk management - D.1. Interest rate risk (Details) - Interest rate risk	Dec. 31, 2019	Dec. 31, 2018
Fixed interest rate
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of debt	75.00%
Concentration percentage	76.00%	68.00%
Floating interest rate
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of debt

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Financial Risk Management, Percentage Of Debt, Maximum

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