Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Low [Member]
Commodity Contracts
Electricity physical forwards	$ 17.00	$ 37.53
Natural gas financial swaps	2.28	2.25
Financial swaps - electricity	40.00	65.30
High [Member]
Commodity Contracts
Electricity physical forwards	156.50	153.33
Natural gas financial swaps	9.59	8.89
Financial swaps - electricity	156.50	107.31
Weighted Average [Member]
Commodity Contracts
Electricity physical forwards	78.73	84.58
Natural gas financial swaps	3.40	3.37
Financial swaps - electricity	92.51	91.33
Assets [Member]
Commodity Contracts
Electricity physical forwards	5,000,000	14,000,000
Natural gas financial swaps	0	0
Financial swaps - electricity	1,000,000	0
Total commodity contracts	6,000,000	14,000,000
Liabilities [Member]
Commodity Contracts
Electricity physical forwards	32,000,000	43,000,000
Natural gas financial swaps	16,000,000	16,000,000
Financial swaps - electricity	1,000,000	0
Total commodity contracts	$ 49,000,000	$ 59,000,000