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Operations by Line of Business (Tables)
 12 Months Ended
Dec. 31, 2012
Segment Reporting [Abstract]  
Summary of continuing operations by line of business
The following is a summary of continuing operations by line of business for the three years ended December 31, 2012:
 
Questar
Consol.
 
Interco.
Trans.
 
Questar
Gas
 
Wexpro
 
Questar
Pipeline
 
Corp and Other
 
(in millions)
2012
 
 
 
 
 
 
 
 
 
 
 
Revenues
 
 
 
 
 
 
 
 
 
 
 
From unaffiliated customers
$
1,098.9

 
$
—

 
$
859.7

 
$
36.1

 
$
203.1

 
$
—

From affiliated companies
—

 
(351.0
)
 
2.5

 
274.1

 
74.4

 
—

Total Revenues
1,098.9

 
(351.0
)
 
862.2

 
310.2

 
277.5

 
—

Operating Expenses
 
 
 
 
 
 
 
 
 
 
 
Cost of sales
192.3

 
(347.7
)
 
533.3

 
—

 
6.7

 
—

Operating and maintenance
180.8

 
(0.2
)
 
119.0

 
26.8

 
35.2

 
—

General and administrative
120.8

 
(0.6
)
 
51.2

 
26.8

 
50.0

 
(6.6
)
Retirement incentive
4.9

 
—

 
2.4

 
0.2

 
0.9

 
1.4

Production and other taxes
47.9

 
—

 
16.2

 
20.8

 
9.1

 
1.8

Depreciation, depletion and amortization
181.6

 
—

 
47.2

 
77.4

 
54.3

 
2.7

Other operating expenses
—

 
(2.5
)
 
—

 
2.5

 
—

 
—

Total Operating Expenses
728.3

 
(351.0
)
 
769.3

 
154.5

 
156.2

 
(0.7
)
Net gain from asset sales
5.1

 
—

 
—

 
2.4

 
2.7

 
—

Operating Income
375.7

 
—

 
92.9

 
158.1

 
124.0

 
0.7

Interest and other income (expense)
7.0

 
(0.7
)
 
5.5

 
2.8

 
0.6

 
(1.2
)
Income from unconsolidated affiliate
3.7

 
—

 
—

 
—

 
3.7

 
—

Interest expense
(57.9
)
 
0.7

 
(24.1
)
 
—

 
(26.3
)
 
(8.2
)
Income taxes
(116.5
)
 
—

 
(27.2
)
 
(57.0
)
 
(37.3
)
 
5.0

Income (Loss) From Continuing Operations
$
212.0

 
$
—

 
$
47.1

 
$
103.9

 
$
64.7

 
$
(3.7
)
Identifiable assets of continuing operations
$
3,757.1

 
$
—

 
$
1,547.3

 
$
836.1

 
$
1,298.9

 
$
74.8

Goodwill
9.8

 
—

 
5.6

 
—

 
4.2

 
—

Investment in unconsolidated affiliate
26.5

 
—

 
—

 
—

 
26.5

 
—

Cash capital expenditures
370.7

 
—

 
162.1

 
144.5

 
60.6

 
3.5

Accrued capital expenditures
366.3

 
—

 
161.2

 
145.5

 
58.6

 
1.0

 
 
 
 
 
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
Revenues
 
 
 
 
 
 
 
 
 
 
 
From unaffiliated customers
$
1,194.4

 
$
—

 
$
965.5

 
$
31.5

 
$
197.4

 
$
—

From affiliated companies
—

 
(331.3
)
 
3.3

 
253.6

 
74.4

 
—

Total Revenues
1,194.4

 
(331.3
)
 
968.8

 
285.1

 
271.8

 
—

Operating Expenses
 
 
 
 
 
 
 
 
 
 
 
Cost of sales
321.5

 
(327.3
)
 
645.7

 
—

 
3.1

 
—

Operating and maintenance
175.9

 
(0.2
)
 
118.5

 
22.3

 
35.3

 
—

General and administrative
117.9

 
(0.5
)
 
51.0

 
24.2

 
46.5

 
(3.3
)
Production and other taxes
52.5

 
—

 
15.0

 
25.6

 
10.1

 
1.8

Depreciation, depletion and amortization
159.9

 
—

 
44.5

 
63.9

 
51.2

 
0.3

Other operating expenses
—

 
(3.3
)
 
—

 
3.3

 
—

 
—

Total Operating Expenses
827.7

 
(331.3
)
 
874.7

 
139.3

 
146.2

 
(1.2
)
Net gain (loss) from asset sales
0.2

 
—

 
—

 
(0.1
)
 
0.3

 
—

Operating Income
366.9

 
—

 
94.1

 
145.7

 
125.9

 
1.2

Interest and other income
10.4

 
(0.6
)
 
5.4

 
4.2

 
0.9

 
0.5

Income from unconsolidated affiliate
3.8

 
—

 
—

 
—

 
3.8

 
—

Interest expense
(56.8
)
 
0.6

 
(25.9
)
 
—

 
(24.5
)
 
(7.0
)
Income taxes
(116.4
)
 
—

 
(27.5
)
 
(54.7
)
 
(38.2
)
 
4.0

Income (Loss) From Continuing Operations
$
207.9

 
$
—

 
$
46.1

 
$
95.2

 
$
67.9

 
$
(1.3
)
Identifiable assets of continuing operations
$
3,532.8

 
$
—

 
$
1,444.4

 
$
768.2

 
$
1,286.6

 
$
33.6

Goodwill
9.8

 
—

 
5.6

 
—

 
4.2

 
—

Investment in unconsolidated affiliate
27.3

 
—

 
—

 
—

 
27.3

 
—

Cash capital expenditures
367.7

 
—

 
121.5

 
136.2

 
104.5

 
5.5

Accrued capital expenditures
373.9

 
—

 
127.7

 
144.3

 
93.8

 
8.1

 
 
 
 
 
 
 
 
 
 
 
 
2010
 

 
 
 
 
 
 
 
 
 
 
Revenues
 

 
 

 
 

 
 

 
 

 
 

From unaffiliated customers
$
1,123.6

 
$
—

 
$
901.8

 
$
24.6

 
$
197.2

 
$
—

From affiliated companies
—

 
(315.3
)
 
1.1

 
240.2

 
74.0

 
—

Total Revenues
1,123.6

 
(315.3
)
 
902.9

 
264.8

 
271.2

 
—

Operating Expenses
 

 
 

 
 

 
 

 
 

 
 

Cost of sales
280.9

 
(313.7
)
 
592.2

 
—

 
2.4

 
—

Operating and maintenance
175.8

 
(0.2
)
 
114.4

 
20.2

 
41.4

 
—

General and administrative
108.5

 
(0.3
)
 
49.9

 
20.5

 
41.0

 
(2.6
)
Separation costs
11.5

 
—

 
—

 
—

 
—

 
11.5

Production and other taxes
50.6

 
—

 
14.1

 
26.8

 
9.0

 
0.7

Depreciation, depletion and amortization
153.4

 
—

 
43.7

 
62.1

 
47.4

 
0.2

Other operating expenses
—

 
(1.1
)
 
—

 
1.1

 
—

 
—

Total Operating Expenses
780.7

 
(315.3
)
 
814.3

 
130.7

 
141.2

 
9.8

Net gain (loss) from asset sales
0.4

 
—

 
—

 
(0.4
)
 
0.8

 
—

Operating Income (Loss)
343.3

 
—

 
88.6

 
133.7

 
130.8

 
(9.8
)
Interest and other income
11.7

 
(0.8
)
 
6.7

 
3.2

 
0.4

 
2.2

Income from unconsolidated affiliate
3.8

 
—

 
—

 
—

 
3.8

 
—

Interest expense
(57.1
)
 
0.8

 
(26.2
)
 
(0.3
)
 
(28.8
)
 
(2.6
)
Income taxes
(109.4
)
 
—

 
(25.2
)
 
(48.5
)
 
(38.8
)
 
3.1

Income (Loss) From Continuing Operations
$
192.3

 
$
—

 
$
43.9

 
$
88.1

 
$
67.4

 
$
(7.1
)
Identifiable assets of continuing operations
$
3,373.6

 
$
—

 
$
1,406.8

 
$
667.1

 
$
1,246.9

 
$
52.8

Goodwill
9.8

 
—

 
5.6

 
—

 
4.2

 
—

Investment in unconsolidated affiliate
27.9

 
—

 
—

 
—

 
27.9

 
—

Cash capital expenditures
320.3

 
—

 
108.6

 
90.6

 
121.0

 
0.1

Accrued capital expenditures
330.4

 
—

 
110.9

 
94.1

 
125.0

 
0.4