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Fair Value of Financial Instruments Fair Value Options Quantitative Disclosure (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Low [Member]    
Commodity Contracts    
Electricity physical forwards $ 5.75 $ 11.17
Natural gas financial swaps 1.60 1.52
Financial swaps - electricity 5.75 8.78
High [Member]    
Commodity Contracts    
Electricity physical forwards 73.58 51.18
Natural gas financial swaps 4.32 4.33
Financial swaps - electricity 73.58 58.42
Weighted Average [Member]    
Commodity Contracts    
Electricity physical forwards 33.39 29.74
Natural gas financial swaps 2.22 2.29
Financial swaps - electricity 37.97 43.71
Assets [Member]    
Commodity Contracts    
Electricity physical forwards 0 0
Natural gas financial swaps 2,000,000 1,000,000
Financial swaps - electricity 5,000,000 4,000,000
Total commodity contracts 7,000,000 5,000,000
Liabilities [Member]    
Commodity Contracts    
Electricity physical forwards 123,000,000 141,000,000
Natural gas financial swaps 1,000,000 1,000,000
Financial swaps - electricity 0 0
Total commodity contracts $ 124,000,000 $ 142,000,000