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Fair value of financial instruments - Carrying Value and Estimated Fair Value of Financial Liabilities (Details) - Secured Debt - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Aug. 31, 2023	Jul. 31, 2023
Second Lien Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, face amount	$ 575		$ 75	$ 500
Level 1 | Fair value | Second Lien Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	597	$ 587
Level 1 | Carrying value | Second Lien Facility
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	562	560
Level 3 | Fair value | Unsecured senior convertible bond
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt	56	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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