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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | $ 178.7 | $ 175.8 | $ 199.3 | $ 198.3
Provision for credit losses | 14.8 | 15.8 | 46.9 | 57.9
Write-offs charged against the allowance | (47.7) | (49.4) | (152.7) | (148.1)
Recovery of amounts previously written off | 14.1 | 13.5 | 43.2 | 43.3
Balance at end of period | 176.8 | 168.5 | 176.8 | 168.5
Change in allowance for credit losses |  |  | 22.5 | 29.8
Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 16.9 | 12.8 | 40.1 | 17.1
Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 199.3 |
Balance at end of period | 176.8 |  | 176.8 |
Wisconsin | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 76.4 | 78.0 | 82.0 | 84.0
Provision for credit losses | 10.2 | 10.0 | 28.1 | 33.6
Write-offs charged against the allowance | (31.8) | (34.6) | (89.8) | (85.5)
Recovery of amounts previously written off | 7.4 | 8.8 | 25.4 | 26.7
Balance at end of period | 72.0 | 72.4 | 72.0 | 72.4
Wisconsin | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 9.8 | 10.2 | 26.3 | 13.6
Illinois | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 97.0 | 91.0 | 111.0 | 105.5
Provision for credit losses | 4.0 | 5.2 | 17.3 | 23.6
Write-offs charged against the allowance | (14.4) | (13.5) | (58.7) | (58.7)
Recovery of amounts previously written off | 6.3 | 4.4 | 16.6 | 15.8
Balance at end of period | 100.0 | 89.7 | 100.0 | 89.7
Illinois | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 7.1 | 2.6 | 13.8 | 3.5
Other States | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 5.3 | 6.8 | 6.3 | 8.8
Provision for credit losses | 0.6 | 0.6 | 1.5 | 0.7
Write-offs charged against the allowance | (1.5) | (1.3) | (4.2) | (3.9)
Recovery of amounts previously written off | 0.4 | 0.3 | 1.2 | 0.8
Balance at end of period | 4.8 | 6.4 | 4.8 | 6.4
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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