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Variable Interest Entities (Schedule of Cash Contributions) (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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- Details
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