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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at beginning of period | $ 162.8 | $ 193.5
Provision for credit losses | 32.6 | 25.9
Write-offs charged against the allowance | (60.1) | (64.9)
Recovery of amounts previously written off | 29.2 | 19.2
Balance at end of period | 159.4 | 190.7
Change in allowance for credit losses | 3.4 | 2.8
Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | (5.1) | 17.0
Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at beginning of period | 162.8 |
Balance at end of period | 159.4 |
Wisconsin | Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at beginning of period | 73.6 | 77.4
Provision for credit losses | 16.1 | 13.8
Write-offs charged against the allowance | (33.8) | (35.6)
Recovery of amounts previously written off | 12.3 | 11.7
Balance at end of period | 60.9 | 83.0
Wisconsin | Public Utilities | Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | (7.3) | 15.7
Illinois | Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at beginning of period | 83.9 | 109.7
Provision for credit losses | 16.3 | 15.1
Write-offs charged against the allowance | (25.6) | (28.0)
Recovery of amounts previously written off | 16.4 | 6.5
Balance at end of period | 93.2 | 104.6
Illinois | Public Utilities | Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | 2.2 | 1.3
Other States | Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at beginning of period | 5.3 | 6.4
Provision for credit losses | 0.2 | (3.0)
Write-offs charged against the allowance | (0.7) | (1.3)
Recovery of amounts previously written off | 0.5 | 1.0
Balance at end of period | 5.3 | 3.1
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

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