v3.26.1
Goodwill, Other Intangible Assets and Out-of-market Contracts - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Finite-Lived Out-of-Market Contracts, Intangible Liabilities [Line Items]          
Impairment of goodwill     $ 0 $ 221,314 $ 0
Amortization expense of intangible assets $ 5,906 $ 9,353 29,991 36,577 $ 40,792
Impairment of intangible assets (excluding goodwill)       3,500  
Power Purchase Agreements ("PPA"), Renewable Energy Credit ("REC") Contract and Out-of-market Contracts, Intangible Liabilities          
Schedule Of Finite-Lived Out-of-Market Contracts, Intangible Liabilities [Line Items]          
Loss on contract termination   $ 6,100 6,900    
Power Purchase Agreements ("PPA"), Renewable Energy Credit ("REC") Contract and Out-of-market Contracts, Intangible Liabilities | Sale of Subsidiary Gain (Loss)          
Schedule Of Finite-Lived Out-of-Market Contracts, Intangible Liabilities [Line Items]          
Decrease in intangible asset     120,900    
Decrease in accumulated amortization       45,300  
Independent Power Producer ("IPP") Segment          
Schedule Of Finite-Lived Out-of-Market Contracts, Intangible Liabilities [Line Items]          
Impairment of goodwill     200,300    
Investment Management          
Schedule Of Finite-Lived Out-of-Market Contracts, Intangible Liabilities [Line Items]          
Impairment of goodwill     $ 21,000    
Impairment of intangible assets (excluding goodwill)       $ 50,400