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Earnings per share - Weighted average number of ordinary share (Details) - shares
 12 Months Ended
Jan. 01, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings per share [line items]          
Beginning of period (in shares) 201,783,532 201,783,532 201,677,981 201,677,981  
Issuance of shares (in shares)   0 0 0  
Purchase of treasury shares (in shares)   0 0 0  
Withdrawal of treasury shares (in shares)   0 0 0  
Transfer of treasury shares (in shares)   450,465 105,551 0  
End of period (in shares)   202,233,997 201,783,532 201,677,981 201,677,981
Weighted number of shares          
Weighted average number of ordinary shares (in shares) 201,783,532 201,901,743 201,747,963 201,677,981 201,677,981
Issuance of shares (in shares)   0 0 0  
Weighted Average Number Of Ordinary Shares Purchased   0 0 0  
Withdrawal of treasury shares (in shares)   0 0 0  
Transfer of treasury shares (in shares)   118,211 69,982 0  
Shares issued          
Earnings per share [line items]          
Beginning of period (in shares) 220,024,713 220,024,713 220,024,713 220,024,713  
Issuance of shares (in shares)   0 0 0  
Purchase of treasury shares (in shares)   0 0 0  
Withdrawal of treasury shares (in shares)   0 0 0  
Transfer of treasury shares (in shares)   0 0 0  
End of period (in shares)   220,024,713 220,024,713 220,024,713 220,024,713
Treasury shares          
Earnings per share [line items]          
Beginning of period (in shares) 18,241,181 18,241,181 18,346,732 18,346,732  
Issuance of shares (in shares)   0 0 0  
Purchase of treasury shares (in shares)   0 0 0  
Withdrawal of treasury shares (in shares)   0 0 0  
Transfer of treasury shares (in shares)   (450,465) (105,551) 0  
End of period (in shares)   17,790,716 18,241,181 18,346,732 18,346,732