v3.26.1
Commitment, Contingencies And Guarantees - Additional Information (Details)
$ in Millions
Feb. 18, 2026
MW
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Loss Contingencies [Line Items]      
Accrued liabilities   $ 269.2 $ 322.6
Black Hills Energy - Colorado Electric      
Loss Contingencies [Line Items]      
Agreement after construction completion expiration period 15 years    
Black Hills Energy - Colorado Electric | Settled Litigation [Member]      
Loss Contingencies [Line Items]      
Accrued liabilities     20.0
Insurance recovery receivable     $ 20.0
Solar | Honors Energy, LLC | Black Hills Energy - Colorado Electric      
Loss Contingencies [Line Items]      
Number of megawatts capacity purchased | MW 200