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Income tax Effective Income Tax Rate Reconcilitation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	21.00%	21.00%	21.00%
Federal tax credits	(15.40%)	(16.50%)	(12.50%)	(16.90%)
State and local taxes, net of federal tax benefit	9.60%	7.30%	8.60%	8.50%
Flow through depreciation and cost basis differences	0.50%	(0.60%)	(0.20%)	(0.60%)
Excess deferred tax amortization	(1.10%)	(1.90%)	(1.70%)	(2.40%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.70%	0.90%	0.80%	0.20%
Effective tax rate	16.30%	10.50%	16.90%	10.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	1.00%	0.30%	0.90%	0.40%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses.

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Percentage of reported income tax benefit (expense) from difference to income tax expense (benefit) computed by applying statutory federal (national) income tax rate to pretax income (loss) from continuing operation, attributable to other reconciling items. Excludes state and local income tax expense (benefit), federal tax expense (benefit), statutory income tax expense (benefit) outside of country of domicile, tax credit, nondeductible expense, deduction, income tax settlement, income tax contingency, and cross-border tax law.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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