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Summary of significant accounting policies - Consolidation (Details) - subsidiary | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of significant accounting policies |  |  |
Number of subsidiaries consolidated | 66 | 71 | 78

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- Definition Represents the number of subsidiaries consolidated. + References No definition available. + Details
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