Commitments and contingencies - Narrative (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Jan. 12, 2026 |
Oct. 21, 2025 |
Oct. 16, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Litigation And Other Matters [Line Items] | ||||||||
| Contingency reserves for litigation liabilities | $ 0 | $ 0 | $ 0 | |||||
| Examination Of Business Tax | ||||||||
| Litigation And Other Matters [Line Items] | ||||||||
| Loss contingency accrual | 0 | 0 | ||||||
| FTC Act, Telemarketing Sales Rule | ||||||||
| Litigation And Other Matters [Line Items] | ||||||||
| Settlement amount awarded to other party | $ 45,000,000.0 | |||||||
| Payments for legal settlements | $ 11,500,000 | $ 33,500,000 | ||||||
| Loss contingency accrual | $ 11,500,000 | |||||||
| Loss reserve established | $ 33,000,000.0 | $ 38,000,000.0 | ||||||
| Legal fees incurred | $ 0 | $ 2,300,000 | $ 0 | $ 4,100,000 | ||||