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Credit Losses - Rollforward of Allowances (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Year | $ 220.1 | $ 140.0
Provision for credit losses | 75.7 | 102.9
Provision for credit losses deferred for future recovery or refund | (13.1) | 55.2
Write-offs charged against the allowance | (129.8) | (132.3)
Recovery of amounts previously written off | 45.4 | 54.4
Sale of PDL residential solar facilities |  | (0.1)
Balance at End of Year | 198.3 | 220.1
Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Year | 220.1 | 139.9
Provision for credit losses | 75.7 | 102.9
Provision for credit losses deferred for future recovery or refund | (13.1) | 55.2
Write-offs charged against the allowance | (129.8) | (132.3)
Recovery of amounts previously written off | 45.4 | 54.4
Sale of PDL residential solar facilities |  | 0.0
Balance at End of Year | 198.3 | 220.1
Wisconsin | Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Year | 102.1 | 59.9
Provision for credit losses | 46.4 | 47.5
Provision for credit losses deferred for future recovery or refund | (16.6) | 24.6
Write-offs charged against the allowance | (74.8) | (65.9)
Recovery of amounts previously written off | 26.9 | 36.0
Sale of PDL residential solar facilities |  | 0.0
Balance at End of Year | 84.0 | 102.1
Illinois | Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Year | 111.6 | 75.9
Provision for credit losses | 25.6 | 51.1
Provision for credit losses deferred for future recovery or refund | 3.5 | 30.6
Write-offs charged against the allowance | (52.5) | (63.0)
Recovery of amounts previously written off | 17.3 | 17.0
Sale of PDL residential solar facilities |  | 0.0
Balance at End of Year | 105.5 | 111.6
Other States | Public Utilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Year | 6.4 | 4.1
Provision for credit losses | 3.7 | 4.3
Provision for credit losses deferred for future recovery or refund | 0.0 | 0.0
Write-offs charged against the allowance | (2.5) | (3.4)
Recovery of amounts previously written off | 1.2 | 1.4
Sale of PDL residential solar facilities |  | 0.0
Balance at End of Year | 8.8 | 6.4
Corporate and Other |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Balance at Beginning of Year | 0.0 | 0.1
Provision for credit losses | 0.0 | 0.0
Provision for credit losses deferred for future recovery or refund | 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 Year | $ 0.0 | 0.0
Corporate and Other | WPS Power Development, LLC Residential Solar Facilities |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Sale of PDL residential solar facilities |  | $ (0.1)

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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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