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Variable Interest Entities (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
Rate
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Variable Interest Entity [Line Items]      
Wind Power Purchase Agreement, Purchase Percentage | Rate 100.00%    
Payment to renewable generation asset developer $ 240.4 $ 85.3 $ 0.0
Rosewater      
Variable Interest Entity [Line Items]      
Nameplate Capacity | MW 102    
Payment to renewable generation asset developer $ 7.4 85.3  
Indiana Crossroads Wind      
Variable Interest Entity [Line Items]      
Nameplate Capacity | MW 302    
Payment to renewable generation asset developer $ 233.0 $ 0.0