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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