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Contingently redeemable preference shares - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 01, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jul. 31, 2019
Mar. 31, 2014
Class of Stock [Line Items]              
Dividends paid on redeemable preference shares   $ 1,100 $ 4,800 $ 2,233 $ 9,632    
Contingently redeemable preference share              
Class of Stock [Line Items]              
Number of shares issued           9,065,200 9,065,200
Preference shares, par value per share             $ 0.01
Preference shares, liquidation preference per share             25.00
Preference shares, issue price per share             $ 24.50
Stated dividend rate (percent)       8.50%      
Number of shares redeemed during the period 6,919,998            
Redemption price per share $ 25.19748            
Contingently redeemable preference share | From June 30, 2014 to June 29, 2019              
Class of Stock [Line Items]              
Stated dividend rate (percent)       8.50%      
Contingently redeemable preference share | On or after June 30, 2019              
Class of Stock [Line Items]              
Preference share dividends, spread on variable rate       6.6785%      
Contingently redeemable preference share | On or after June 30, 2019 | 3 month LIBOR | Minimum              
Class of Stock [Line Items]              
Stated dividend rate (percent)       1.00%      
Arch Capital Group Limited | Contingently redeemable preference share              
Class of Stock [Line Items]              
Repurchase of preference shares $ 11,500