Employee benefit obligations - Schedule of Plan Asset Composition (Details) |
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Disclosure of defined benefit plans [abstract] | ||
| Cash and cash equivalents | 4.10% | 5.90% |
| Debt instruments | 20.30% | 21.90% |
| Equity instruments | 33.80% | 33.50% |
| Real estate | 22.50% | 21.30% |
| Mortgages | 4.20% | 3.60% |
| Alternative assets | 15.10% | 13.80% |
| Total | 100.00% | 100.00% |
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- Definition The percentage cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Cash and cash equivalents, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Debt instruments, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- References No definition available.
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- Definition The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Equity instruments, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The percentage other types of assets not separately disclosed contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Other assets, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The percentage real estate contributes to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]] [Contrast: Real estate, amount contributed to fair value of plan assets] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Mortgages, Percentage Contributed To Fair Value Of Plan Assets No definition available.
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- Definition Plan Assets At Fair Value Allocation Percentage No definition available.
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