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Variable Interest Entities (Schedule of Cash Contributions) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash Contributions Noncontrolling Interest [Line Items]      
Obligation to the Developer $ 277.5 $ 69.7 $ 0.0
Rosewater      
Cash Contributions Noncontrolling Interest [Line Items]      
NIPSCO Cash Contribution 0.1 0.7  
Tax Equity Partners Cash Contribution 7.5 86.1  
Obligation to the Developer 6.0 69.7  
Total Cash Contributions 13.6 156.5  
Indiana Crossroads Wind      
Cash Contributions Noncontrolling Interest [Line Items]      
NIPSCO Cash Contribution 2.7 0.0  
Tax Equity Partners Cash Contribution 237.6    
Obligation to the Developer 271.5 0.0  
Total Cash Contributions $ 511.8 $ 0.0