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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
NSP-Minnesota and Subsidiaries Valuation and Qualifying Accounts Years Ended Dec. 31
 
 
Allowance for bad debts
(Millions of Dollars)
 
2019
 
2018
 
2017
Balance at Jan. 1
 
$
23.5

 
$
21.3

 
$
20.0

Additions charged to costs and expenses
 
13.0

 
16.2

 
15.7

Additions charged to other accounts (a)
 
6.5

 
4.1

 
3.8

Deductions from reserves (b)
 
(20.0
)
 
(18.1
)
 
(18.2
)
Balance at Dec. 31
 
$
23.0

 
$
23.5

 
$
21.3

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