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Income taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Income taxes - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Operating loss carry-forward
Effective tax rate, AETR		0.00%
Effective tax rate (as a percent)	22.09%		15.36%
Federal
Operating loss carry-forward
Operating loss carryforwards				$ 897.0
Operating loss carryforwards subject to expiration				530.2
Operating loss carryforwards not subject to expiration				366.8
Federal \| Discrete Charge
Operating loss carry-forward
Decrease in valuation allowance, deferred tax asset		$ 237.9
State \| Oklahoma
Operating loss carry-forward
Operating loss carryforwards				$ 459.3
State \| TEXAS
Operating loss carry-forward
Deferred Tax Assets, State Taxes		$ 3.4