Investment in ATC and ATC Holdco (Details-3) - ATC [Member] - Affiliated Entity [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Receivables [Abstract]
Other Receivables	$ 2.1		$ 2.1		$ 5.3
Operating Costs and Expenses [Abstract]
Operating Costs and Expenses, Total	$ 9.1	$ 8.5	$ 18.2	$ 16.9