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Stock option and award plan: Incentive award plan fair value assumptions (Details) - Employee Stock Option - $ / shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stock option and award plan
Weighted-average per share grant date fair value (in dollars per share)	$ 12.95	$ 12.81	$ 10.73
Assumptions used for determining the fair value of options granted
Dividend yield (as a percent)	6.00%	5.80%	5.90%
Expected volatility (as a percent)	34.90%	33.40%	33.10%
Risk-free interest rate (as a percent)	4.10%	3.80%	3.00%
Expected life of the option term (in years)	4 years 1 month 6 days	4 years 1 month 6 days	4 years 1 month 6 days

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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.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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