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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Accounting Policies [Line Items]  
Cost of sales detail
The details of Questar's consolidated cost of sales are as follows:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions)
Questar Gas
 
 
 
 
 
Gas purchases
$
104.2

 
$
221.2

 
$
245.4

Operator service fee
274.0

 
253.4

 
240.0

Transportation and storage
79.6

 
78.4

 
78.1

Gathering
20.5

 
25.0

 
23.6

Royalties
32.0

 
38.9

 
37.2

Storage (injection) withdrawal, net
1.9

 
3.0

 
(0.8
)
Purchased-gas account adjustment
16.1

 
20.6

 
(36.8
)
Other
5.0

 
5.2

 
5.5

Total Questar Gas cost of natural gas sold
533.3

 
645.7

 
592.2

Elimination of Questar Gas cost of natural gas sold - affiliated parties
(347.7
)
 
(327.3
)
 
(313.7
)
Total Questar Gas cost of natural gas sold - unaffiliated parties
185.6

 
318.4

 
278.5

Questar Pipeline
 
 
 
 
 
Total Questar Pipeline cost of sales
6.7

 
3.1

 
2.4

Total cost of sales
$
192.3

 
$
321.5

 
$
280.9
Average depreciation, depletion and amortization rates of the Company's capitalized costs
The following represent average depreciation, depletion and amortization rates of the Company's capitalized costs:
 
Year Ended December 31,
 
2012
 
2011
 
2010
Questar Gas distribution plant
2.8
%
 
2.8
%
 
2.9
%
Cost-of-service gas and oil properties, per Mcfe
$
1.49

 
$
1.49

 
$
1.47

Questar Pipeline transportation, storage and other energy services
3.4
%
 
3.5
%
 
3.5
%
Amounts recorded in the income statement for the capitalization of funds used during construction and interest costs
Amounts recorded in the Consolidated Statements of Income for the capitalization of AFUDC and interest costs are disclosed in the table below:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions)
AFUDC (recorded as an increase in interest and other income)
 
 
 
 
 
Wexpro
$
2.1

 
$
3.3

 
$
2.4

Questar Pipeline
0.2

 
1.1

 
0.3

Total AFUDC
$
2.3

 
$
4.4

 
$
2.7

 
 
 
 
 
 
Capitalized interest costs (recorded as a reduction of interest expense)
 
 
 
 
 
Questar Gas
$
0.1

 
$
0.1

 
$
0.2

Questar Pipeline
0.1

 
0.5

 
1.0

Total capitalized interest costs
$
0.2

 
$
0.6

 
$
1.2
Components of AOCI, income taxes for each component of OCI, hedging AOCI rollforward
The components of consolidated AOCI, net of income taxes, as reported in Questar's Consolidated Balance Sheets, are shown below:
 
December 31,
 
2012
 
2011
 
(in millions)
Pension liability
$
(203.5
)
 
$
(182.7
)
Postretirement benefits liability
(19.7
)
 
(20.1
)
Interest rate cash flow hedges
(23.2
)
 
(23.4
)
Long-term investment
0.1

 
0.1

Accumulated other comprehensive loss
$
(246.3
)
 
$
(226.1
)

Income taxes allocated to each component of Questar's consolidated OCI are shown in the table below. Expenses are in parentheses.
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(in millions)
Change in unrecognized actuarial loss
$
13.6

 
$
62.3

 
$
(6.8
)
Change in unrecognized prior-service costs
(1.0
)
 
(1.1
)
 
(1.4
)
Interest rate cash flow hedges
(0.2
)
 
13.8

 
—

Change in fair value of long-term investment
(0.1
)
 
—

 
—

Discontinued operations, change in unrealized fair value of derivatives
—

 
—

 
51.6

Income taxes
$
12.3

 
$
75.0

 
$
43.4
Questar Pipeline [Member]
  
Accounting Policies [Line Items]  
Components of AOCI, income taxes for each component of OCI, hedging AOCI rollforward
The component of consolidated AOCI, net of income taxes, as reported in Questar Pipeline's Consolidated Balance Sheets, is shown below:
 
December 31,
 
2012
 
2011
 
(in millions)
Interest rate cash flow hedges
$
(23.2
)
 
$
(23.4
)
Accumulated other comprehensive loss
$
(23.2
)
 
$
(23.4
)




A reconciliation of the Company's beginning and ending after-tax AOCI balances related to interest rate cash flow hedging activities (see Note 5) is shown below. All cash flow hedging activity is attributable to Questar Pipeline.
 
Year Ended December 31,
 
2012
 
2011
 
(in millions)
Accumulated other comprehensive loss at beginning of year
$
(23.4
)
 
$
—

Net change associated with current period hedging transactions
—

 
(23.5
)
Net amount reclassified into earnings
0.2

 
0.1

Accumulated other comprehensive loss at end of year
$
(23.2
)
 
$
(23.4
)