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Income taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
Income taxes - Narrative (Details) - USD ($) $ in Millions	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