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Income taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |
Effective tax rate, AETR |  |  |  | 0.00% |
Effective tax rate (as a percent) | 0.50% |  | 21.89% |  | 22.83%
Federal |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |
Operating loss carryforwards | $ 922.1 |  |  | $ 922.1 |
Operating loss carryforwards subject to expiration | 477.7 |  |  | 477.7 |
Operating loss carryforwards not subject to expiration | 444.4 |  |  | 444.4 |
Federal | Discrete Charge |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |
Decrease in valuation allowance, deferred tax asset |  | $ 237.9 |  |  |
State | Oklahoma |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |
Operating loss carryforwards | 297.1 |  |  | 297.1 |
State | TEXAS |  |  |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |  |  |
Net deferred tax asset, state | $ 6.0 |  |  | $ 6.0 |

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