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Fair value measurements - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value Disclosures [Abstract]        
Derivative, gain (loss), statement of income or comprehensive income [extensible enumeration] Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense) Nonoperating Income (Expense)