Investment in ATC and ATC Holdco (Details-3) - ATC [Member] - Related Party [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Receivables [Abstract]
Other Receivables	$ 5.2		$ 5.2		$ 4.8
Operating Costs and Expenses [Abstract]
Operating Costs and Expenses, Total	$ 8.5	$ 7.8	$ 16.9	$ 15.7