Stock-based compensation - Schedule of Significant Assumptions Used in Determining Fair Value of Performance Units (Details) - Performance Units |
3 Months Ended | |
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Mar. 31, 2026 |
Mar. 31, 2025 |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Dividend yield | 1.54% | 1.37% |
| Expected life (years) | 2 years 11 months 1 day | 2 years 9 months 21 days |
| Risk-free rate of interest for expected life | 3.56% | 3.89% |
| Volatility for expected life | 28.86% | 25.78% |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Details
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