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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
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)
 
Balance at End of Period
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

December 31, 2017
 
108.0

 
96.7

 
16.4

 
(77.9
)
 
143.2


(1) 
Net of recoveries.

(2) 
Represents amounts written off to the reserve, net of adjustments to regulatory assets.