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Supplemental Gas and Oil Information - Unaudited (Tables)
 12 Months Ended
Dec. 31, 2014
Extractive Industries [Abstract]  
Capitalized costs of cost-of-service gas and oil properties net of the related accumulated depreciation and amortization
Capitalized costs of gas and oil properties and the related amounts of accumulated depreciation, depletion and amortization are shown below:
 
December 31,
 
2014
 
2013
 
(in millions)
Wexpro
 
 
 
Proved properties
$
1,675.6

 
$
1,625.5

Unproved properties
12.8

 
0.9

Total Wexpro capitalized costs
1,688.4

 
1,626.4

Accumulated depreciation, depletion and amortization
(757.3
)
 
(689.8
)
Net Wexpro capitalized costs
931.1

 
936.6

Net Questar Gas capitalized costs
6.4

 
7.2

Net capitalized costs
$
937.5

 
$
943.8
Cost incurred for cost-of-service gas and oil development activities
The costs incurred for gas and oil development activities are displayed in the table below. The costs incurred to develop proved undeveloped reserves were $28.9 million in 2014, $106.3 million in 2013 and $50.4 million in 2012.
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(in millions)
Property acquisition
 
 
 
 
 
Unproved
$
11.9

 
$
0.3

 
$
0.6

Proved
54.1

 
106.4

 
—

Exploration (capitalized and expensed)
1.6

 
—

 
—

Development
49.1

 
133.1

 
146.9

Total costs incurred
$
116.7

 
$
239.8

 
$
147.5
Results of operations for cost-of-service gas- and oil-producing activities, before corporate overhead and interest expenses
Following are the results of operations for gas- and oil-producing activities, excluding corporate overhead and interest costs:
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(in millions)
Revenues
 
 
 
 
 
From unaffiliated customers
$
35.6

 
$
45.1

 
$
36.1

From affiliated company(1)
350.3

 
294.8

 
274.1

Total revenues
385.9

 
339.9

 
310.2

Production costs
67.5

 
57.5

 
50.1

Exploration expenses
1.6

 
—

 
—

Depreciation, depletion and amortization
100.5

 
85.8

 
77.4

Abandonment and impairment
2.0

 
—

 
—

Total expenses
171.6

 
143.3

 
127.5

Revenues less expenses
214.3

 
196.6

 
182.7

Income taxes
(71.4
)
 
(70.5
)
 
(64.8
)
Results of operations for gas- and oil-producing activities (excluding corporate overhead and interest costs)
$
142.9

 
$
126.1

 
$
117.9


(1) Primarily represents revenues received from Questar Gas pursuant to the Wexpro agreements. Revenues include reimbursement of general and administrative expenses amounting to $30.5 million in 2014, $27.5 million in 2013 and $26.5 million in 2012.
Estimated quantities of cost-of-service proved gas and oil reserves
Estimated quantities of proved gas and oil reserves are set forth below:
 
Natural Gas
 
Oil and NGL
 
Natural Gas Equivalents
 
(Bcf)
 
(Mbbl)
 
(Bcfe)
Proved Reserves
 
 
 
 
 
Balances at December 31, 2011
758.7

 
5,344

 
790.7

Revisions of previous estimates
(158.4
)
 
(122
)
 
(159.0
)
Extensions and discoveries
154.4

 
1,612

 
164.0

Production
(57.5
)
 
(665
)
 
(61.5
)
Balances at December 31, 2012
697.2

 
6,169

 
734.2

Revisions of previous estimates
(112.8
)
 
(1,348
)
 
(120.8
)
Extensions and discoveries
153.5

 
857

 
158.6

Purchase of reserves in place
133.9

 
556

 
137.2

Production
(60.6
)
 
(617
)
 
(64.3
)
Balances at December 31, 2013
811.2

 
5,617

 
844.9

Revisions of previous estimates
(220.2
)
 
(442
)
 
(222.7
)
Extensions and discoveries
4.0

 
205

 
5.2

Purchase of reserves in place
35.9

 
157

 
36.8

Sale of reserves in place
(0.5
)
 
(219
)
 
(1.9
)
Production
(64.3
)
 
(587
)
 
(67.8
)
Balances at December 31, 2014
566.1

 
4,731

 
594.5

 
 
 
 
 
 
Proved Developed Reserves
 
 
 
 
 
Balances at December 31, 2011
491.2

 
4,420

 
517.7

Balances at December 31, 2012
523.9

 
4,967

 
553.7

Balances at December 31, 2013
560.0

 
4,384

 
586.3

Balances at December 31, 2014
552.9

 
4,678

 
581.0

 
 
 
 
 
 
Proved Undeveloped Reserves
 
 
 
 
 
Balances at December 31, 2011
267.5

 
924

 
273.0

Balances at December 31, 2012
173.3

 
1,202

 
180.5

Balances at December 31, 2013
251.2

 
1,233

 
258.6

Balances at December 31, 2014
13.2

 
53

 
13.5
Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure [Table Text Block]
The standardized measure of future net cash flows relating to non-cost-of-service proved reserves is presented in the table below:
 
December 31,
 
2014
 
(in millions)
Future cash inflows
$
190.7

Future production costs
(65.9
)
Future income tax expenses
(43.7
)
Future net cash flows
81.1

10% annual discount for estimated timing of net cash flows
(34.4
)
Standardized measure of discounted future net cash flows
$
46.7
Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows [Table Text Block]
The principal sources of change in the standardized measure of future net cash flows relating to non-cost-of-service proved reserves are presented in the table below:
 
Year Ended December 31,
 
2014
 
(in millions)
Balance at beginning of year
$
—

Net increase due to purchases of reserves in place
46.8

Sales of gas and oil produced during the period, net of production costs
(1.5
)
Net change in prices and production costs related to future production
0.8

Accretion of discount
0.6

Net Change
46.7

Balance at end of year
$
46.7