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Earnings per share - Narrative (Details) - shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Class A shares |  |
Earnings per share [line items] |  |
Anti-dilutive share options excluded from calculation of diluted earnings per share (in shares) | 5,278,761 | 8,763,385
Class B Shares |  |
Earnings per share [line items] |  |
Anti-dilutive share options excluded from calculation of diluted earnings per share (in shares) | 2,099,551 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Instruments With Anti-Dilutive Effect Not Included In Calculation Of Diluted Earnings Per Share + References No definition available. + Details
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- Details
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- Details
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