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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
WISCONSIN PUBLIC SERVICE CORPORATION
VALUATION AND QUALIFYING ACCOUNTS

Allowance for Doubtful Accounts
(in millions)
 
Balance at Beginning of Period
 
Expense (1)
 
Net Write-offs (2)
 
Balance at End of Period
December 31, 2019
 
$
4.2

 
$
5.5

 
$
(5.5
)
 
$
4.2

December 31, 2018
 
4.0

 
6.0

 
(5.8
)
 
4.2

December 31, 2017
 
3.0

 
5.0

 
(4.0
)
 
4.0


(1) 
Net of recoveries.

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