Pension obligations (Narrative) (Details) - Pension obligations [Member] $ in Millions	12 Months Ended
Dec. 31, 2025 USD ($) Year	Dec. 31, 2024
Statements [Line Items]
Estimate of contributions expected to be paid to plan for next annual reporting period	$ 1.6
Weighted average duration of defined benefit obligation	17 years 7 months 6 days	18 years 8 months 12 days
Defined benefit obligation [Member]
Statements [Line Items]
Expected rate of salary increase	2.75%	2.75%
Defined benefit obligation [Member] \| 2024 [Member]
Statements [Line Items]
Expected rate of salary increase	3.00%
Defined benefit obligation [Member] \| Thereafter [Member]
Statements [Line Items]
Expected rate of salary increase	2.75%
Actuarial assumption of discount rates [Member]
Statements [Line Items]
Reasonably possible increase in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (8.1)
Reasonably possible decrease in actuarial assumption, basis points	50
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 9.2
Actuarial assumption of expected rates of salary increases [Member]
Statements [Line Items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 1.1
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (1.0)
Actuarial assumptions of life expectancy [Member]
Statements [Line Items]
Reasonably possible increase in life expectancy (years) \| Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 0.8
Reasonably possible decrease in life expectancy (years) \| Year	1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ (0.8)
Active members [Member]
Statements [Line Items]
Weighted average duration of defined benefit obligation	19 years	19 years 9 months 18 days
Deferred members [Member]
Statements [Line Items]
Weighted average duration of defined benefit obligation	19 years	17 years 9 months 18 days
Retired members [Member]
Statements [Line Items]
Weighted average duration of defined benefit obligation	8 years 4 months 24 days	9 years 4 months 24 days

Reasonably possible decrease in actuarial assumption, basis points

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Reasonably possible decrease in life expectancy (years)

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Reasonably possible increase in actuarial assumption, basis points

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Reasonably possible increase in life expectancy (years)

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- Definition

The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [domain]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

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