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Stock-based compensation - Schedule of Significant Assumptions Used in Determining Fair Value of Performance Units (Details) - Performance Units	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.37%
Expected life (years)	2 years 9 months 21 days
Risk-free rate for expected life	3.89%
Volatility for expected life	25.78%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield		1.62%
Expected life (years)		2 years 4 months 17 days
Risk-free rate for expected life		3.83%
Volatility for expected life		24.24%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield		1.81%
Expected life (years)		2 years 9 months 18 days
Risk-free rate for expected life		4.37%
Volatility for expected life		26.33%

X

- 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.

+ References

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-Topic 718
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-Section 50
-Paragraph 2
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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.

+ References

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- Definition

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

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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.

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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.

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