Share-based compensation - Schedule of Assumptions Used to Determine the Fair Value of Long-Term Incentive Plan (LTIP) Linked to Total Return to Shareholders (TRS) (Details) - LTIP linked to TRS - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.25%	4.19%	1.71%
Expected life in years	3 years	3 years	3 years
Expected volatility	52.50%	33.10%	31.00%
Range of expected volatility for Peer Group, minimum	12.30%	28.70%	25.40%
Range of expected volatility for Peer Group, maximum	52.50%	38.80%	76.70%
Grant date fair value (in dollars per share)	$ 17.28	$ 55.98	$ 54.92