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CREDIT LOSSES - ROLLFORWARD OF ALLOWANCES (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | $ 220.1 | $ 140.0
Provision for credit losses | 22.1 | 28.8
Write-offs charged against the allowance | (21.8) | (52.6)
Recovery of amounts previously written off | 13.3 | 15.8
Balance at End of Period | 259.1 | 164.8
Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | 25.4 | 32.8
Utility Operations |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 220.1 | 139.9
Provision for credit losses | 22.1 | 28.8
Write-offs charged against the allowance | (21.8) | (52.6)
Recovery of amounts previously written off | 13.3 | 15.8
Balance at End of Period | 259.1 | 164.7
Utility Operations | Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | 25.4 | 32.8
Wisconsin | Utility Operations |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 102.1 | 59.9
Provision for credit losses | 13.7 | 13.7
Write-offs charged against the allowance | (18.5) | (19.7)
Recovery of amounts previously written off | 9.9 | 10.5
Balance at End of Period | 129.5 | 67.7
Wisconsin | Utility Operations | Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | 22.3 | 3.3
Illinois | Utility Operations |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 111.6 | 75.9
Provision for credit losses | 7.1 | 14.4
Write-offs charged against the allowance | (2.8) | (31.6)
Recovery of amounts previously written off | 3.0 | 4.9
Balance at End of Period | 122.0 | 93.1
Illinois | Utility Operations | Uncollectible expense |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Provision for credit losses deferred for future recovery or refund | 3.1 | 29.5
Other States | Utility Operations |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 6.4 | 4.1
Provision for credit losses | 1.3 | 0.7
Write-offs charged against the allowance | (0.5) | (1.3)
Recovery of amounts previously written off | 0.4 | 0.4
Balance at End of Period | 7.6 | 3.9
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
Corporate and Other |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Period | 0.0 | 0.1
Provision for credit losses | 0.0 | 0.0
Write-offs charged against the allowance | 0.0 | 0.0
Recovery of amounts previously written off | 0.0 | 0.0
Balance at End of Period | 0.0 | 0.1
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

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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=121599337&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=121611835&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=121599337&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=121599878&loc=SL82895884-210446 + Details
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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + 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 (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + 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 (d) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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