Investment in ATC and ATC Holdco (Details-3) - ATC [Member] - Affiliated Entity [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Receivables [Abstract]
Other Receivables	$ 5.3		$ 5.3		$ 4.8
Operating Costs and Expenses [Abstract]
Operating Costs and Expenses, Total	$ 8.5	$ 7.9	$ 25.4	$ 23.6