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Schedule of Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2012
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts
QUESTAR CORPORATION
Schedule of Valuation and Qualifying Accounts

Column A
Description
Column B
Beginning Balance
 
Column C Amounts charged
to expense
 
Column D Deductions for accounts written off and other
 
Column E
Ending Balance
 
(in millions)
Year Ended December 31, 2012
 
 
 
 
 
 
 
Allowance for bad debts
$
3.2

 
$
1.2

 
$
(1.3
)
 
$
3.1

Year Ended December 31, 2011
 
 
 
 
 
 
 
Allowance for bad debts
3.2

 
2.4

 
(2.4
)
 
3.2

Year Ended December 31, 2010
 
 
 
 
 
 
 
Allowance for bad debts
5.4

 
0.5

 
(2.7
)
 
3.2


QUESTAR GAS COMPANY
Schedule of Valuation and Qualifying Accounts

Column A
Description
Column B
Beginning Balance
 
Column C Amounts charged
to expense
 
Column D Deductions for accounts written off and other
 
Column E
Ending Balance
 
(in millions)
Year Ended December 31, 2012
 
 
 
 
 
 
 
Allowance for bad debts
$
2.9

 
$
1.1

 
$
(1.2
)
 
$
2.8

Year Ended December 31, 2011
 
 
 
 
 
 
 
Allowance for bad debts
2.9

 
2.4

 
(2.4
)
 
2.9

Year Ended December 31, 2010
 
 
 
 
 
 
 
Allowance for bad debts
5.1

 
0.5

 
(2.7
)
 
2.9


QUESTAR PIPELINE COMPANY
Schedule of Valuation and Qualifying Accounts

Column A
Description
Column B
Beginning Balance
 
Column C Amounts charged
to expense
 
Column D Deductions for accounts written off and other
 
Column E
Ending Balance
 
(in millions)
Year Ended December 31, 2012
 
 
 
 
 
 
 
Allowance for bad debts
$
0.3

 
$
0.1

 
$
(0.1
)
 
$
0.3

Year Ended December 31, 2011
 
 
 
 
 
 
 
Allowance for bad debts
0.3

 
—

 
—

 
0.3

Year Ended December 31, 2010
 
 
 
 
 
 
 
Allowance for bad debts
0.3

 
—

 
—

 
0.3