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Financial instruments - Schedule of Derivative Instruments Designated as Amortized into Hedged Activity (Details) - Dec. 31, 2024 - subordinated unsecured notes - Designated as a hedge $ in Thousands, $ in Thousands	USD ($)	CAD ($)
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap
Derivative [Line Items]
Notional quantity	$ 350,000
Par value	350,000
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap
Derivative [Line Items]
Notional quantity	750,000
Par value	$ 750,000
Canadian dollar Senior unsecured notes | Cross-currency interest rate swap
Derivative [Line Items]
Notional quantity		$ 400,000
Par value		$ 400,000

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

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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