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Variable Interest Entities (Narrative) (Details)
 3 Months Ended 4 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Rate
MW
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Rate
MW
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Variable Interest Entity [Line Items]              
Nameplate Capacity | MW 102       102    
Wind Power Purchase Agreement, Purchase Percentage | Rate 100.00%       100.00%    
Additional Obligation to the Developer   $ 6,000,000   $ 6,000,000      
Payment to renewable generation asset developer         $ (7,400,000) $ 0  
Total Obligation to the Developer $ 75,700,000       75,700,000    
Total Contributions 170,100,000       170,100,000    
VIE Net Assets 168,000,000       168,000,000   $ 156,400,000
Noncontrolling interest in consolidated subsidiaries 89,200,000       89,200,000   $ 85,600,000
Net loss attributable to noncontrolling interest $ (1,000,000)   $ 0   $ (3,400,000) $ 0  
Rosewater Wind Farm              
Variable Interest Entity [Line Items]              
Wind Power Purchase Agreement, Purchase Percentage | Rate 100.00%       100.00%    
NIPSCO              
Variable Interest Entity [Line Items]              
Cash Contribution   100,000   800,000      
Tax Equity Partner              
Variable Interest Entity [Line Items]              
Cash Contribution   $ 7,500,000   $ 93,600,000