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Share-based compensation - Assumptions used in the Black Scholes option pricing model to determine the fair value of share options (Details) - Stock option - Employees and directors - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based compensation.
Risk-free interest rate	3.90%	4.10%	4.00%	3.90%
Expected volatility	74.10%	83.30%	77.30%	83.50%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
Unrecognized compensation expense
Total unrecognized compensation expense related to the unvested employee and director	$ 58.2		$ 58.2
Unrecognized compensation cost expected to be recognized over a weighted average period			2 years 6 months

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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