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Acquisitions and Dispositions (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
MW
Dec. 31, 2021
MW
Jun. 30, 2021
USD ($)
MW
Mar. 31, 2021
USD ($)
MW
Dry Lake Solar Project        
Noncash or Part Noncash Acquisition, Other Assets Acquired       $ 18.9
Dry Lake Solar Project | Noncontrolling Interest [Member]        
Noncash or Part Noncash Acquisition, Other Assets Acquired       $ 18.9
Generation And Marketing [Member] | Dry Lake Solar Project        
Percentage of an Asset Acquired       75.00%
Wind Generation MWs | MW       100
Noncash or Part Noncash Acquisition, Value of Assets Acquired       $ 114.0
Payments to Acquire Businesses, Gross       103.0
Generation And Marketing [Member] | Dry Lake Solar Project | Noncontrolling Interest [Member]        
Noncash or Part Noncash Acquisition, Other Assets Acquired       $ 19.0
Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities        
Wind Generation MWs | MW       1,485
Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Subsequent Event [Member]        
Wind Generation MWs | MW 999 287 199  
Noncash or Part Noncash Acquisition, Value of Assets Acquired     $ 2,000.0  
Payments to Acquire Businesses, Gross     $ 307.0  
Property, Plant and Equipment | Generation And Marketing [Member] | Dry Lake Solar Project        
Noncash or Part Noncash Acquisition, Other Assets Acquired       $ 133.0
Accounts Payable [Member] | Generation And Marketing [Member] | Dry Lake Solar Project        
Noncash or Part Noncash Acquisition, Other Assets Acquired       $ 11.0
Public Service Co Of Oklahoma [Member] | Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Subsequent Event [Member]        
Percentage of an Asset Acquired     45.50%  
Southwestern Electric Power Co [Member] | Vertically Integrated Utilities [Member] | North Central Wind Energy Facilities | Subsequent Event [Member]        
Percentage of an Asset Acquired     54.50%