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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
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, 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

December 31, 2014
 
61.0

 
—

 
49.8

 
18.4

 
(54.7
)
 
74.5


(1) 
Net of recoveries.

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