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Schedule of Valuation and Qualifying Accounts (Notes)
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts
Financial Statement Schedules:

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, 2015
 
 
 
 
 
 
 
Allowance for bad debts
$
1.7

 
$
2.1

 
$
(1.7
)
 
$
2.1

Year Ended December 31, 2014
 
 
 
 
 
 
 
Allowance for bad debts
1.7

 
1.7

 
(1.7
)
 
1.7

Year Ended December 31, 2013
 
 
 
 
 
 
 
Allowance for bad debts
3.1

 
0.2

 
(1.6
)
 
1.7


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, 2015
 
 
 
 
 
 
 
Allowance for bad debts
$
1.4

 
$
2.1

 
$
(1.8
)
 
$
1.7

Year Ended December 31, 2014
 
 
 
 
 
 
 
Allowance for bad debts
1.4

 
1.7

 
(1.7
)
 
1.4

Year Ended December 31, 2013
 
 
 
 
 
 
 
Allowance for bad debts
2.8

 
0.2

 
(1.6
)
 
1.4


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, 2015
 
 
 
 
 
 
 
Allowance for bad debts
$
0.3

 
$
—

 
$
0.1

 
$
0.4

Year Ended December 31, 2014
 
 
 
 
 
 
 
Allowance for bad debts
0.3

 
—

 
—

 
0.3

Year Ended December 31, 2013
 
 
 
 
 
 
 
Allowance for bad debts
0.3

 
—

 
—

 
0.3