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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | $ 190.7 | $ 213.8 | $ 193.5 | $ 199.3
Provision for credit losses | 23.7 | 11.1 | 49.6 | 32.1
Write-offs charged against the allowance | (59.3) | (51.5) | (124.2) | (105.0)
Recovery of amounts previously written off | 17.9 | 17.7 | 37.1 | 29.1
Balance at end of period | 166.9 | 178.7 | 166.9 | 178.7
Change in allowance for credit losses |  |  | 26.6 | 20.6
Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (6.1) | (12.4) | 10.9 | 23.2
Public Utilities |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 193.5 |
Balance at end of period | 166.9 |  | 166.9 |
Wisconsin | Public Utilities |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 83.0 | 90.9 | 77.4 | 82.0
Provision for credit losses | 9.8 | 6.7 | 23.6 | 17.9
Write-offs charged against the allowance | (35.9) | (29.1) | (71.5) | (58.0)
Recovery of amounts previously written off | 10.4 | 11.8 | 22.1 | 18.0
Balance at end of period | 68.7 | 76.4 | 68.7 | 76.4
Wisconsin | Public Utilities | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 1.4 | (3.9) | 17.1 | 16.5
Illinois | Public Utilities |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 104.6 | 116.5 | 109.7 | 111.0
Provision for credit losses | 12.2 | 4.8 | 27.3 | 13.3
Write-offs charged against the allowance | (22.3) | (21.3) | (50.3) | (44.3)
Recovery of amounts previously written off | 6.2 | 5.5 | 12.7 | 10.3
Balance at end of period | 93.2 | 97.0 | 93.2 | 97.0
Illinois | Public Utilities | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (7.5) | (8.5) | (6.2) | 6.7
Other States | Public Utilities |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 3.1 | 6.4 | 6.4 | 6.3
Provision for credit losses | 1.7 | (0.4) | (1.3) | 0.9
Write-offs charged against the allowance | (1.1) | (1.1) | (2.4) | (2.7)
Recovery of amounts previously written off | 1.3 | 0.4 | 2.3 | 0.8
Balance at end of period | 5.0 | 5.3 | 5.0 | 5.3
Other States | Public Utilities | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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