v3.26.1
Investment in ATC and ATC Holdco (Details-3) - ATC [Member] - Affiliated Entity [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Receivables [Abstract]      
Other Receivables $ 3.0   $ 2.5
Operating Costs and Expenses [Abstract]      
Operating Costs and Expenses, Total $ 11.2 $ 10.2