Electric utility segment - Consolidated and Unconsolidated Variable Interest Entities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) entity agreement
Variable Interest Entity [Line Items]
Number of consolidation VIEs | entity	2
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Accounts receivable and unbilled revenues, net | $	$ 324.7
Subsidiaries
Variable Interest Entity [Line Items]
Number of power purchase agreements (PPAs) | agreement	4