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Fair value of financial instruments - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total principal debt | $ 625 | $ 625
Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total principal debt | 575 | 575
$575 million secured bond (Level 1) | Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total principal debt | 575 | $ 575
Level 1 | $575 million secured bond (Level 1) | Secured Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total principal debt | $ 575 |

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