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Financial instruments - Derivative Instruments Designated as Amortized into Hedged Activity (Details) - Jun. 30, 2024 - Designated as a hedge $ in Thousands, $ in Thousands | USD ($) | CAD ($)
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U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | $350,000 subordinated unsecured notes |  |
Derivative [Line Items] |  |
Notional quantity | $ 350,000 |
Par value | 350,000 |
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | $750,000 subordinated unsecured notes |  |
Derivative [Line Items] |  |
Notional quantity | 750,000 |
Par value | 750,000 |
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | $1,150,000 senior unsecured notes |  |
Derivative [Line Items] |  |
Par value | 1,150,000 |
U.S. dollar Subordinated unsecured notes | Forward-starting interest rate swap | First $575,000 of the $1,150,000 senior unsecured notes issuance |  |
Derivative [Line Items] |  |
Notional quantity | 575,000 |
Par value | 575,000 |
Canadian dollar senior unsecured notes | Cross-currency interest rate swap | C$400,000 subordinated unsecured notes |  |
Derivative [Line Items] |  |
Notional quantity |  | $ 400,000
Par value | $ 400 |

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