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Stock award plan - Performance-based Restricted Stock Units (Details) - Chief Executive Officer - shares	1 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2025	Dec. 31, 2024
Performance-based restricted stock units (PSUs)
Restricted Stock Awards and Units
Total PSUs granted for which the performance or market conditions were not yet satisfied	25,000	150,000	131,250	206,250
PSUs with performance or market conditions satisfied during the period			(75,000)
Performance based
Restricted Stock Awards and Units
Total PSUs granted for which the performance or market conditions were not yet satisfied			100,000	175,000
PSUs with performance or market conditions satisfied during the period			(75,000)
Market Conditions
Restricted Stock Awards and Units
Total PSUs granted for which the performance or market conditions were not yet satisfied			31,250	31,250

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were granted for meeting certain specified performance conditions during the reporting period.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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