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Variable Interest Entities (Narrative) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Rate
MW
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Rate
MW
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Variable Interest Entity [Line Items]              
Nameplate Capacity | MW 102       102    
Wind Power Purchase Agreement, Purchase Percentage | Rate 100.00%       100.00%    
Total Equity Membership Interest 100.00%       100.00%    
Obligation to the Developer $ 69,700,000       $ 69,700,000 $ 0 $ 0
Payment to renewable generation asset developer         85,300,000 0 0
Total Contributions 170,100,000       170,100,000    
VIE Net Assets 156,400,000       156,400,000    
Noncontrolling interest in consolidated subsidiaries 85,600,000       85,600,000 0  
Net Income (Loss) Attributable to Noncontrolling Interest 3,400,000 $ 0 $ 0 $ 0 3,400,000 $ 0 $ 0
Expected Future Obligation to the Developer 6,000,000.0       $ 6,000,000.0    
NIPSCO              
Variable Interest Entity [Line Items]              
Cash Contribution 700,000            
Future Cash Contribution $ 100,000            
Rosewater              
Variable Interest Entity [Line Items]              
Wind Power Purchase Agreement, Purchase Percentage | Rate 100.00%       100.00%    
Tax Equity Partner              
Variable Interest Entity [Line Items]              
Cash Contribution $ 86,100,000            
Future Cash Contribution $ 7,500,000