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Revenue Recognition Revenue Recognition (Allowance for Credit Losses) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts Receivable Allowance For Credit Loss [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 26.2 | $ 22.9 | $ 23.9
Current period provisions | 21.4 | 39.8 |
Write-offs charged against allowance | 25.1 | 61.6 |
Recoveries of amounts previously written off | 7.0 | 20.8 |
Corporate and Other |  |  |
Accounts Receivable Allowance For Credit Loss [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss | 0.0 | 0.8 | 0.8
Current period provisions | 0.0 | 0.0 |
Write-offs charged against allowance | (0.8) | 0.0 |
Recoveries of amounts previously written off | 0.0 | 0.0 |
Columbia Operations |  |  |
Accounts Receivable Allowance For Credit Loss [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss | 13.0 | 10.2 | 11.1
Current period provisions | 15.2 | 28.3 |
Write-offs charged against allowance | 19.0 | 49.2 |
Recoveries of amounts previously written off | 6.6 | 20.0 |
NIPSCO Operations |  |  |
Accounts Receivable Allowance For Credit Loss [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss | 13.2 | 11.9 | $ 12.0
Current period provisions | 6.2 | 11.5 |
Write-offs charged against allowance | 5.3 | 12.4 |
Recoveries of amounts previously written off | $ 0.4 | $ 0.8 |

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