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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS | SCHEDULE II WEC ENERGY GROUP, INC. VALUATION AND QUALIFYING ACCOUNTS
Allowance for Doubtful Accounts (in millions) |  | Balance at Beginning of Period |  | Expense (1) |  | Deferral |  | Net Write-offs (2) |  | Sale of Business |  | Balance at End of Period
December 31, 2020 |  | $ | 140.0 |  |  | $ | 102.8 |  |  | $ | 55.3 |  |  | $ | (77.9) |  |  | $ | (0.1) |  |  | $ | 220.1 |
December 31, 2019 |  | 149.2 |  |  | 85.8 |  |  | 11.4 |  |  | (106.4) |  |  | — |  |  | 140.0 |
December 31, 2018 |  | 143.2 |  |  | 94.7 |  |  | (5.5) |  |  | (83.2) |  |  | — |  |  | 149.2 |
(1) Net of recoveries. (2) Represents amounts written off to the reserve, net of adjustments to regulatory assets.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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