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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Low [Member]    
Commodity Contracts    
Electricity physical forwards $ 18.88 $ 11.17
Natural gas financial swaps 1.86 1.52
Financial swaps - electricity 21.78 8.78
High [Member]    
Commodity Contracts    
Electricity physical forwards 148.39 51.18
Natural gas financial swaps 5.01 4.33
Financial swaps - electricity 96.00 58.42
Weighted Average [Member]    
Commodity Contracts    
Electricity physical forwards 51.68 29.74
Natural gas financial swaps 2.51 2.29
Financial swaps - electricity 47.47 43.71
Assets [Member]    
Commodity Contracts    
Electricity physical forwards 5,000,000 0
Natural gas financial swaps 8,000,000 1,000,000
Financial swaps - electricity 2,000,000 4,000,000
Total commodity contracts 15,000,000 5,000,000
Liabilities [Member]    
Commodity Contracts    
Electricity physical forwards 72,000,000 141,000,000
Natural gas financial swaps 0 1,000,000
Financial swaps - electricity 1,000,000 0
Total commodity contracts $ 73,000,000 $ 142,000,000