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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | $ 213.8 | $ 200.6 | $ 199.3 | $ 198.3
Provision for credit losses | 11.1 | 18.8 | 32.1 | 42.1
Write-offs charged against the allowance | (51.5) | (41.2) | (105.0) | (98.7)
Recovery of amounts previously written off | 17.7 | 14.2 | 29.1 | 29.8
Balance at end of period | 178.7 | 175.8 | 178.7 | 175.8
Change in allowance for credit losses |  |  | 20.6 | 22.5
Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (12.4) | (16.6) | 23.2 | 4.3
Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 199.3 |
Balance at end of period | 178.7 |  | 178.7 |
Wisconsin | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 90.9 | 85.7 | 82.0 | 84.0
Provision for credit losses | 6.7 | 11.8 | 17.9 | 23.6
Write-offs charged against the allowance | (29.1) | (22.1) | (58.0) | (50.9)
Recovery of amounts previously written off | 11.8 | 8.0 | 18.0 | 17.9
Balance at end of period | 76.4 | 78.0 | 76.4 | 78.0
Wisconsin | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (3.9) | (5.4) | 16.5 | 3.4
Illinois | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 116.5 | 107.0 | 111.0 | 105.5
Provision for credit losses | 4.8 | 7.1 | 13.3 | 18.4
Write-offs charged against the allowance | (21.3) | (17.9) | (44.3) | (45.2)
Recovery of amounts previously written off | 5.5 | 6.0 | 10.3 | 11.4
Balance at end of period | 97.0 | 91.0 | 97.0 | 91.0
Illinois | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (8.5) | (11.2) | 6.7 | 0.9
Other States | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 6.4 | 7.9 | 6.3 | 8.8
Provision for credit losses | (0.4) | (0.1) | 0.9 | 0.1
Write-offs charged against the allowance | (1.1) | (1.2) | (2.7) | (2.6)
Recovery of amounts previously written off | 0.4 | 0.2 | 0.8 | 0.5
Balance at end of period | 5.3 | 6.8 | 5.3 | 6.8
Other States | Utility Operations | 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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