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Variable Interest Entities (Schedule of Cash Contributions) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash Contributions Noncontrolling Interest [Line Items]      
Obligation to the Developer $ 0.0 $ 277.5 $ 69.7
Consolidated Variable Interest Entities      
Cash Contributions Noncontrolling Interest [Line Items]      
NIPSCO Cash Contributions 151.8 2.8 0.7
Tax Equity Partners Cash Contribution 21.2 245.1 86.1
Obligation to the Developer 0.0 277.5 69.7
Total Cash Contributions $ 173.0 $ 525.4 $ 156.5