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Share-based compensation - Schedule Assumptions used in Determining Fair Value of Stock Options (Details) - Employee stock option - $ / shares | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Assumptions for Stock Awards Granted [Abstract] |  |
Share price at grant date, minimum (in USD per share) | $ 32.38 | $ 29.21
Share price at grant date, maximum (in USD per share) | 34.71 | 29.60
Exercise price, minimum (in USD per share) | 32.38 | 29.21
Exercise price, maximum (in USD per share) | $ 34.71 | $ 29.60
Expected volatility, minimum | 51.08% | 53.30%
Expected volatility, maximum | 53.52% | 55.78%
Expected life (years) | 5 years 6 months | 5 years 6 months
Risk free rate, minimum | 3.68% | 4.14%
Risk free rate, maximum | 3.78% | 4.41%
Minimum |  |
Assumptions for Stock Awards Granted [Abstract] |  |
Fair value (in USD per share) | $ 16.94 | $ 15.70
Maximum |  |
Assumptions for Stock Awards Granted [Abstract] |  |
Fair value (in USD per share) | $ 17.62 | $ 16.21

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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Maximum Share Price During Grant Date + References No definition available. + Details
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- Definition Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Minimum Share Price Grant Date + References No definition available. + Details
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- Definition Share-Based Compensation Arrangements By Share Based Payment Award, Options, Grants In Period, Maximum Exercise Price + References No definition available. + Details
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- Definition Share-Based Compensation Arrangements By Share Based Payment Award, Options, Grants In Period, Minimum Exercise Price + References No definition available. + Details
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- Definition The estimated measure of the maximum 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The estimated measure of the minimum 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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