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Income tax Effective Income Tax Rate Reconcilitation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Tax Disclosure [Abstract]        
Federal statutory tax rate 21.00% 21.00% 21.00% 21.00%
Federal tax credits (12.70%) (18.50%) (10.70%) (17.10%)
State and local taxes, net of federal tax benefit 8.20% 9.20% 8.50% 9.10%
Flow through depreciation and cost basis differences (0.10%) (0.70%) (0.40%) (0.60%)
Excess deferred tax amortization (2.30%) (2.90%) (2.10%) (2.70%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 1.00% 0.30% 0.10% (0.20%)
Effective tax rate 16.20% 8.90% 17.30% 10.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent 1.10% 0.50% 0.90% 0.50%