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Income tax Effective Income Tax Rate Reconcilitation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Tax Disclosure [Abstract]        
Federal statutory tax rate 21.00% 21.00% 21.00% 21.00%
Federal tax credits (16.50%) (14.20%) (16.90%) (11.10%)
State and local taxes, net of federal tax benefit 7.30% 5.80% 8.50% 7.90%
Flow through depreciation and cost basis differences (0.60%) (0.70%) (0.60%) 0.10%
Excess deferred tax amortization (1.90%) (4.40%) (2.40%) (3.90%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 1.20% 3.80% 0.60% 1.80%
Effective tax rate 10.50% 11.30% 10.20% 15.80%