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Financial risk management - D.1. Interest rate risk (Details) - Interest rate risk	Dec. 31, 2018	Dec. 31, 2017
Fixed interest rate
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of debt	70.00%
Concentration percentage	68.00%	65.00%
Floating interest rate
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of debt	30.00%

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Financial Risk Management, Percentage Of Debt, Maximum

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