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Shareholders' contributions - Share Capital (Details) - USD ($)
 12 Months Ended
May 24, 2023
Nov. 17, 2022
May 17, 2022
Apr. 20, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Number of shares              
Reduction of issued share capital of the company (in shares)       (11,000,000)      
Share capital and share premium              
Balance at beginning of period         $ 1,163,643,000 $ 1,047,830,000 $ 963,724,000
Reduction of issued share capital of the company       $ (16,500,000)      
Employee share options exercised         214,000 2,124,000  
Restricted shares granted and units vested         2,937,000 1,824,000 448,000
Purchase of own shares         (26,242,000) (36,844,000) (66,463,000)
Dividends provided for and paid to mayor shareholders $ (17,500,000) $ (17,500,000) $ (17,500,000)   (35,000,000) (35,000,000)  
Balance at end of period         $ 1,265,648,000 $ 1,163,643,000 $ 1,047,830,000
Number of shares              
Number of shares              
Stock at beginning of period (shares)         111,382,000 122,382,000 122,382,000
Reduction of issued share capital of the company (in shares)           (11,000,000)  
Stock at end of period (shares)         111,382,000 111,382,000 122,382,000
Share capital and share premium              
Balance at beginning of period         $ 167,073,000 $ 183,573,000 $ 183,573,000
Balance at end of period         167,073,000 167,073,000 183,573,000
Share capital and share premium              
Share capital and share premium              
Balance at beginning of period         960,242,000 1,034,633,000 1,086,388,000
Reduction of issued share capital of the company           (16,500,000)  
Employee share options exercised         236,000 2,432,000  
Restricted shares granted and units vested           4,647,000 3,594,000
Restricted shares granted         7,528,000    
Purchase of own shares         (22,123,000) (29,970,000) (55,349,000)
Dividends provided for and paid to mayor shareholders         (35,000,000) (35,000,000)  
Balance at end of period         $ 910,883,000 $ 960,242,000 $ 1,034,633,000