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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2017
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 |  | Acquisitions of Businesses |  | Expense (1) |  | Deferral |  | Net Write-offs (2) |  | Balance at End of Period
December 31, 2017 |  | $ | 108.0 |  |  | $ | — |  |  | $ | 96.7 |  |  | $ | 16.4 |  |  | $ | (77.9 | ) |  | $ | 143.2 |
December 31, 2016 |  | 113.3 |  |  | — |  |  | 87.4 |  |  | (5.9 | ) |  | (86.8 | ) |  | 108.0 |
December 31, 2015 |  | 74.5 |  |  | 54.3 |  |  | 56.7 |  |  | 8.2 |  |  | (80.4 | ) |  | 113.3 |
(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 any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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