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Fair value of financial instruments - Carrying Value and Estimated Fair Value of Financial Liabilities (Details) - Secured Debt - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025 | Aug. 31, 2023 | Jul. 31, 2023
--- | --- | --- | --- | ---
$575 million secured bond (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt instrument, face amount | $ 575 |  | $ 75 | $ 500
Level 1 | Fair value | $575 million secured bond (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt | 595 | $ 598 |  |
Level 1 | Carrying value | $575 million secured bond (Level 1) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt | 564 | 563 |  |
Level 3 | Fair value | Unsecured senior convertible bond |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt | 55 | 56 |  |
Level 3 | Carrying value | Unsecured senior convertible bond |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt | $ 50 | $ 50 |  |

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