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Notes payable and other borrowings - Additional Information (Details) kr in Millions, $ in Millions, € in Billions | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2025 SEK (kr) | Dec. 31, 2025 EUR (€) | Jun. 18, 2025 USD ($) | Jun. 18, 2025 SEK (kr) | Jun. 24, 2024 USD ($) | Jun. 24, 2024 SEK (kr) | Apr. 19, 2024 USD ($) | Mar. 21, 2024 USD ($) | Mar. 21, 2024 SEK (kr) | Aug. 16, 2023 USD ($) | Aug. 16, 2023 SEK (kr) | May 16, 2023 USD ($) | May 16, 2023 SEK (kr)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes payable and other borrowings redeemed | $ 86.0 | $ 169.0 | $ 150.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings | 30.0 | 17.0 | 13.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Swedish Medium Term Note Program (SMTN) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of notes authorised | 1,100.0 |  |  | kr 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Notes payable and other borrowings redeemed | 0.0 | 34.0 | 66.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Issued notes repurchased | 0.0 | 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Euro Medium Term Note Program (EMTN) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum amount of notes authorised | 3,100.0 |  |  |  | € 3 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Bonds, 500 million due 2026, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  |  |  |  |  |  | $ 49.5 | kr 500 |  |  |  |
Senior Unsecured Bonds, 750 million due 2026, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  |  |  | $ 74.2 | kr 750 |  |  |  |  |  |  |
Senior Unsecured Bonds, 250 million due 2027, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  |  |  | $ 24.7 | kr 250 |  |  |  |  |  |  |
Senior Unsecured Bonds, 600 million due 2027, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  | $ 65.0 | kr 600 |  |  |  |  |  |  |  |  |
Senior Unsecured Bonds, 900 million due 2028, EMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  | $ 98.0 | kr 900 |  |  |  |  |  |  |  |  |
Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense on borrowings | $ 10.0 | $ 5.0 | $ 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Subordinated Liabilities, 500 million due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50.0 | kr 500
Subordinated Liabilities, 250 million due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.0 | kr 250 |  |
Subordinated Liabilities, 100 million due 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal amount |  |  |  |  |  |  |  |  |  | $ 100.0 |  |  |  |  |  |
Stockholm Interbank Offered Rate (STIBOR) | Senior Unsecured Bonds, 500 million due 2026, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  | 2.50% | 2.50% |  |  |  |
Stockholm Interbank Offered Rate (STIBOR) | Senior Unsecured Bonds, 750 million due 2026, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  | 1.80% | 1.80% |  |  |  |  |  |  |
Stockholm Interbank Offered Rate (STIBOR) | Senior Unsecured Bonds, 250 million due 2027, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  | 2.10% | 2.10% |  |  |  |  |  |  |
Stockholm Interbank Offered Rate (STIBOR) | Senior Unsecured Bonds, 600 million due 2027, SMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  | 1.60% | 1.60% |  |  |  |  |  |  |  |  |
Stockholm Interbank Offered Rate (STIBOR) | Senior Unsecured Bonds, 900 million due 2028, EMTN program |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  | 1.80% | 1.80% |  |  |  |  |  |  |  |  |
Stockholm Interbank Offered Rate (STIBOR) | Subordinated Liabilities, 500 million due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% | 7.50%
Stockholm Interbank Offered Rate (STIBOR) | Subordinated Liabilities, 250 million due 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% | 7.50% |  |
Secured Overnight Financing Rate (SOFR) | Subordinated Liabilities, 100 million due 2034 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |  |
Minimum | Reference rate | Subordinated Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 7.00% |  |  | 7.00% | 7.00% |  |  |  |  |  |  |  |  |  |  |
Maximum | Reference rate | Subordinated Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis | 7.50% |  |  | 7.50% | 7.50% |  |  |  |  |  |  |  |  |  |  |

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