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Performance B.4.1. Share-based compensation - Assumptions (Details)
 12 Months Ended
Dec. 31, 2024
yr
$ / shares
Performance Share Plan 2023 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free 
rate % 4.66%
Dividend yield % 0.00%
Share price volatility % 52.88%
Award term (years) | yr 2.82
Share fair value (in usd per share) | $ / shares $ 31.13
Performance Share Plan 2022 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free 
rate % 2.01%
Dividend yield % 0.00%
Share price volatility % 47.94%
Award term (years) | yr 2.80
Share fair value (in usd per share) | $ / shares $ 29.12
Performance Share Plan 2021 (Relative TSR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free 
rate % 0.29%
Dividend yield % 1.28%
Share price volatility % 46.28%
Award term (years) | yr 2.82
Share fair value (in usd per share) | $ / shares $ 52.99
Performance share plan 2024 (SAR)  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Risk-free 
rate % 4.31%
Dividend yield % 0.00%
Share price volatility % 38.20%
Award term (years) | yr 6.50
Share fair value (in usd per share) | $ / shares $ 9.35