Investments (Details-4) - ATC [Member] - Affiliated Entity [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Costs and Expenses [Abstract]
Operating Costs and Expenses, Total	$ 33.8	$ 31.4	$ 32.0
Receivables [Abstract]
Other Receivables	$ 5.3	$ 4.8