Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Employee benefit plans - Narrative (Details)	12 Months Ended
Employee benefit plans - Narrative (Details)	Dec. 31, 2025	Dec. 31, 2019	Dec. 31, 2014
Guernsey \| Pension plans
Defined Benefit Plan Disclosure [Line Items]
Remaining life expectancy, inactive participants	39 years
Remaining life expectancy, active members	15 years
Postretirement Health Coverage 2014 Amendment \| Bermuda \| Post- retirement medical benefit plan
Defined Benefit Plan Disclosure [Line Items]
Remaining life expectancy		16 years	21 years