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Schedule II, Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II, Valuation and Qualifying Accounts
NSP-WISCONSIN AND SUBSIDIARIES
VALUATION AND QUALIFYING ACCOUNTS
YEARS ENDED DEC. 31, 2018, 2017 AND 2016
 
Allowance for bad debts
(Millions of Dollars)
2018
 
2017
 
2016
Balance at Jan. 1
$
4.9

 
$
4.9

 
$
5.1

Additions Charged to Costs and Expenses
4.2

 
4.1

 
3.7

Additions Charged to Other Accounts (a)
1.0

 
0.9

 
1.1

Deductions from Reserves (b)
(4.5
)
 
(5.0
)
 
(5.0
)
Balance at Dec. 31
$
5.6

 
$
4.9

 
$
4.9

(a) 
Recovery of amounts previously written off.
(b) 
Deductions relate primarily to bad debt write-offs.