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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | $ 175.8 | $ 231.7 | $ 198.3 | $ 220.1
Provision for credit losses | 15.8 | 15.9 | 57.9 | 53.6
Write-offs charged against the allowance | (49.4) | (46.8) | (148.1) | (89.7)
Recovery of amounts previously written off | 13.5 | 10.6 | 43.3 | 33.1
Balance at end of period | 168.5 | 199.7 | 168.5 | 199.7
Change in allowance for credit losses |  |  | 29.8 |
Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 12.8 | (11.7) | 17.1 | (17.4)
Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period |  |  | 198.3 |
Balance at end of period | 168.5 |  | 168.5 |
Wisconsin | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 78.0 | 114.4 | 84.0 | 102.1
Provision for credit losses | 10.0 | 10.7 | 33.6 | 33.8
Write-offs charged against the allowance | (34.6) | (16.2) | (85.5) | (51.2)
Recovery of amounts previously written off | 8.8 | 5.7 | 26.7 | 19.8
Balance at end of period | 72.4 | 76.4 | 72.4 | 76.4
Wisconsin | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 10.2 | (38.2) | 13.6 | (28.1)
Illinois | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 91.0 | 109.0 | 105.5 | 111.6
Provision for credit losses | 5.2 | 4.4 | 23.6 | 16.7
Write-offs charged against the allowance | (13.5) | (29.9) | (58.7) | (36.7)
Recovery of amounts previously written off | 4.4 | 4.7 | 15.8 | 12.4
Balance at end of period | 89.7 | 114.7 | 89.7 | 114.7
Illinois | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 2.6 | 26.5 | 3.5 | 10.7
Other States | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at beginning of period | 6.8 | 8.3 | 8.8 | 6.4
Provision for credit losses | 0.6 | 0.8 | 0.7 | 3.1
Write-offs charged against the allowance | (1.3) | (0.7) | (3.9) | (1.8)
Recovery of amounts previously written off | 0.3 | 0.2 | 0.8 | 0.9
Balance at end of period | 6.4 | 8.6 | 6.4 | 8.6
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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