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Financial risk management - D.1. Interest rate risk (Details) - Interest rate risk | Dec. 31, 2018 | Dec. 31, 2017
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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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