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Equity - Authorized shares and secondary follow-on equity offering (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 16, 2018 shares | Dec. 31, 2019 EquityInstruments $ / shares shares | Dec. 31, 2018 EquityInstruments $ / shares shares | Dec. 31, 2017 $ / shares shares
Equity |  |  |  |
Par value | $ / shares |  | $ 0 | $ 0 | $ 0
Number of authorized shares |  | 1,011,876,677 | 1,011,876,677 | 1,011,876,677
Treasury shares |  | (15,136,057) | (15,212,365) | (13,257,945)
Shares fully subscribed and paid |  | 996,740,620 | 996,664,312 | 998,618,732
Forfeited during the year | EquityInstruments |  | 294,541 | 121,451 |
Series A shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 923,824,804 | 923,824,804 | 877,856,206
Series B shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 88,051,873 | 88,051,873 | 134,020,471
Conversion of equivalent number of shares | 45,968,598 |  |  |
Fixed Class I |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 24,180 | 24,180 | 24,180
Shares fully subscribed and paid |  | 24,180 | 24,180 | 24,180
Fixed Class I | Series A shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 10,478 | 10,478 | 3,224
Fixed Class I | Series B shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 13,702 | 13,702 | 20,956
Variable Class II |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 1,011,852,497 | 1,011,852,497 | 1,011,852,497
Treasury shares |  | (15,136,057) | (15,212,365) | (13,257,945)
Shares fully subscribed and paid |  | 996,716,440 | 996,640,132 | 998,594,552
Variable Class II | Series A shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 923,814,326 | 923,814,326 | 877,852,982
Variable Class II | Series B shares |  |  |  |
Equity |  |  |  |
Number of authorized shares |  | 88,038,171 | 88,038,171 | 133,999,515

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- Definition The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References No definition available. + Details
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