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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | $ 231.7 | $ 164.7 | $ 220.1 | $ 140.0
Provision for credit losses | 15.9 | 22.2 | 53.6 | 71.3
Write-offs charged against the allowance | (46.8) | (25.4) | (89.7) | (114.6)
Recovery of amounts previously written off | 10.6 | 12.5 | 33.1 | 42.6
Balance at End of Period | 199.7 | 173.3 | 199.7 | 173.3
Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (11.7) | (0.7) | (17.4) | 34.0
Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 231.7 | 164.6 | 220.1 | 139.9
Provision for credit losses | 15.9 | 22.1 | 53.6 | 71.2
Write-offs charged against the allowance | (46.8) | (25.4) | (89.7) | (114.6)
Recovery of amounts previously written off | 10.6 | 12.5 | 33.1 | 42.6
Balance at End of Period | 199.7 | 173.1 | 199.7 | 173.1
Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (11.7) | (0.7) | (17.4) | 34.0
Wisconsin | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 114.4 | 77.9 | 102.1 | 59.9
Provision for credit losses | 10.7 | 14.8 | 33.8 | 40.8
Write-offs charged against the allowance | (16.2) | (14.5) | (51.2) | (52.2)
Recovery of amounts previously written off | 5.7 | 7.8 | 19.8 | 28.4
Balance at End of Period | 76.4 | 88.5 | 76.4 | 88.5
Wisconsin | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | (38.2) | 2.5 | (28.1) | 11.6
Illinois | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 109.0 | 82.7 | 111.6 | 75.9
Provision for credit losses | 4.4 | 6.3 | 16.7 | 28.3
Write-offs charged against the allowance | (29.9) | (10.0) | (36.7) | (59.5)
Recovery of amounts previously written off | 4.7 | 4.4 | 12.4 | 13.1
Balance at End of Period | 114.7 | 80.2 | 114.7 | 80.2
Illinois | Utility Operations | Uncollectible expense |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Provision for credit losses deferred for future recovery or refund | 26.5 | (3.2) | 10.7 | 22.4
Other States | Utility Operations |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 8.3 | 4.0 | 6.4 | 4.1
Provision for credit losses | 0.8 | 1.0 | 3.1 | 2.1
Write-offs charged against the allowance | (0.7) | (0.9) | (1.8) | (2.9)
Recovery of amounts previously written off | 0.2 | 0.3 | 0.9 | 1.1
Balance at End of Period | 8.6 | 4.4 | 8.6 | 4.4
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
Corporate and Other |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Balance at Beginning of Period | 0.0 | 0.1 | 0.0 | 0.1
Provision for credit losses | 0.0 | 0.1 | 0.0 | 0.1
Write-offs charged against the allowance | 0.0 | 0.0 | 0.0 | 0.0
Recovery of amounts previously written off | 0.0 | 0.0 | 0.0 | 0.0
Balance at End of Period | 0.0 | 0.2 | 0.0 | 0.2
Corporate and Other | 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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- Definition Amount of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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