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Operations by Line of Business (Tables)
 12 Months Ended
Dec. 31, 2011
Notes to Financial Statements [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, 2011:


 
Questar
Consol.
 
Interco.
Trans.
 
Wexpro
 
Questar
Pipeline
 
Questar
Gas
 
Corp.
 
(in millions)
2011
 
 
 
 
 
 
 
 
 
 
 
Revenues
 
 
 
 
 
 
 
 
 
 
 
From unaffiliated customers
$
1,194.4

 
$
—

 
$
31.5

 
$
197.4

 
$
965.5

 
$
—

From affiliated companies
—

 
(331.3
)
 
253.6

 
74.4

 
3.3

 
—

Total Revenues
1,194.4

 
(331.3
)
 
285.1

 
271.8

 
968.8

 
—

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
Cost of sales
321.5

 
(327.3
)
 
—

 
3.1

 
645.7

 
—

Operating and maintenance
175.9

 
(0.2
)
 
22.3

 
35.3

 
118.5

 
—

General and administrative
117.9

 
(0.5
)
 
24.2

 
46.5

 
51.0

 
(3.3
)
Production and other taxes
52.5

 
—

 
25.6

 
10.1

 
15.0

 
1.8

Depreciation, depletion and amortization
159.9

 
—

 
63.9

 
51.2

 
44.5

 
0.3

Other operating expenses
—

 
(3.3
)
 
3.3

 
—

 
—

 
—

Total Operating Expenses
827.7

 
(331.3
)
 
139.3

 
146.2

 
874.7

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

 
—

 
(0.1
)
 
0.3

 
—

 
—

Operating Income
366.9

 
—

 
145.7

 
125.9

 
94.1

 
1.2

Interest and other income
10.4

 
(0.6
)
 
4.2

 
0.9

 
5.4

 
0.5

Income from unconsolidated affiliate
3.8

 
—

 
—

 
3.8

 
—

 
—

Interest expense
(56.8
)
 
0.6

 
—

 
(24.5
)
 
(25.9
)
 
(7.0
)
Income taxes
(116.4
)
 
—

 
(54.7
)
 
(38.2
)
 
(27.5
)
 
4.0

Income (Loss) From Continuing Operations
$
207.9

 
$
—

 
$
95.2

 
$
67.9

 
$
46.1

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

 
$
—

 
$
768.2

 
$
1,286.6

 
$
1,444.4

 
$
33.6

Goodwill
9.8

 
—

 
—

 
4.2

 
5.6

 
—

Investment in unconsolidated affiliate
27.3

 
—

 
—

 
27.3

 
—

 
—

Cash capital expenditures
367.7

 
—

 
136.2

 
104.5

 
121.5

 
5.5

Accrued capital expenditures
373.9

 
—

 
144.3

 
93.8

 
127.7

 
8.1

 
 
 
 
 
 
 
 
 
 
 
 
2010
 
 
 
 
 
 
 
 
 
 
 
Revenues
 
 
 
 
 
 
 
 
 
 
 
From unaffiliated customers
$
1,123.6

 
$
—

 
$
24.6

 
$
197.2

 
$
901.8

 
$
—

From affiliated companies
—

 
(315.3
)
 
240.2

 
74.0

 
1.1

 
—

Total Revenues
1,123.6

 
(315.3
)
 
264.8

 
271.2

 
902.9

 
—

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
Cost of sales
280.9

 
(313.7
)
 
—

 
2.4

 
592.2

 
—

Operating and maintenance
175.8

 
(0.2
)
 
20.2

 
41.4

 
114.4

 
—

General and administrative
108.5

 
(0.3
)
 
20.5

 
41.0

 
49.9

 
(2.6
)
Separation costs
11.5

 
—

 
—

 
—

 
—

 
11.5

Production and other taxes
50.6

 
—

 
26.8

 
9.0

 
14.1

 
0.7

Depreciation, depletion and amortization
153.4

 
—

 
62.1

 
47.4

 
43.7

 
0.2

Other operating expenses
—

 
(1.1
)
 
1.1

 
—

 
—

 
—

Total Operating Expenses
780.7

 
(315.3
)
 
130.7

 
141.2

 
814.3

 
9.8

Net gain (loss) from asset sales
0.4

 
—

 
(0.4
)
 
0.8

 
—

 
—

Operating Income (Loss)
343.3

 
—

 
133.7

 
130.8

 
88.6

 
(9.8
)
Interest and other income
11.7

 
(0.8
)
 
3.2

 
0.4

 
6.7

 
2.2

Income from unconsolidated affiliate
3.8

 
—

 
—

 
3.8

 
—

 
—

Interest expense
(57.1
)
 
0.8

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

 
(48.5
)
 
(38.8
)
 
(25.2
)
 
3.1

Income (Loss) From Continuing Operations
$
192.3

 
$
—

 
$
88.1

 
$
67.4

 
$
43.9

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

 
$
—

 
$
667.1

 
$
1,246.9

 
$
1,406.8

 
$
52.8

Goodwill
9.8

 
—

 
—

 
4.2

 
5.6

 
—

Investment in unconsolidated affiliate
27.9

 
—

 
—

 
27.9

 
—

 
—

Cash capital expenditures
320.3

 
—

 
90.6

 
121.0

 
108.6

 
0.1

Accrued capital expenditures
330.4

 
—

 
94.1

 
125.0

 
110.9

 
0.4

 
 
 
 
 
 
 
 
 
 
 
 
2009
 

 
 
 
 
 
 
 
 
 
 
Revenues
 

 
 

 
 

 
 

 
 

 
 

From unaffiliated customers
$
1,109.9

 
$
—

 
$
17.8

 
$
173.2

 
$
918.9

 
$
—

From affiliated companies
—

 
(298.3
)
 
225.1

 
72.2

 
1.0

 
—

Total Revenues
1,109.9

 
(298.3
)
 
242.9

 
245.4

 
919.9

 
—

Operating expenses
 

 
 

 
 

 
 

 
 

 
 

Cost of sales
331.4

 
(296.8
)
 
—

 
1.6

 
626.6

 
—

Operating and maintenance
167.6

 
(0.1
)
 
21.2

 
40.1

 
106.4

 
—

General and administrative
93.4

 
(0.4
)
 
17.0

 
36.1

 
42.9

 
(2.2
)
Production and other taxes
42.4

 
—

 
20.0

 
8.6

 
13.3

 
0.5

Depreciation, depletion and amortization
147.1

 
—

 
58.8

 
44.3

 
43.8

 
0.2

Other operating expenses
—

 
(1.0
)
 
1.0

 
—

 
—

 
—

Total Operating Expenses
781.9

 
(298.3
)
 
118.0

 
130.7

 
833.0

 
(1.5
)
Net gain (loss) from asset sales
0.2

 
—

 
(0.3
)
 
0.5

 
—

 
—

Operating Income
328.2

 
—

 
124.6

 
115.2

 
86.9

 
1.5

Interest and other income
12.5

 
(0.9
)
 
3.2

 
2.5

 
7.6

 
0.1

Income from unconsolidated affiliate
3.8

 
—

 
—

 
3.8

 
—

 
—

Interest expense
(59.6
)
 
0.9

 
(0.9
)
 
(29.5
)
 
(28.5
)
 
(1.6
)
Income taxes
(104.4
)
 
—

 
(46.2
)
 
(33.8
)
 
(24.4
)
 
—

Income From Continuing Operations
$
180.5

 
$
—

 
$
80.7

 
$
58.2

 
$
41.6

 
$
—

Identifiable assets of continuing operations
$
3,189.7

 
$
—

 
$
621.5

 
$
1,165.4

 
$
1,335.2

 
$
67.6

Goodwill
9.8

 
—

 
—

 
4.2

 
5.6

 
—

Investment in unconsolidated affiliate
28.1

 
—

 
—

 
28.1

 
—

 
—

Cash capital expenditures
299.8

 
—

 
116.2

 
100.8

 
82.6

 
0.2

Accrued capital expenditures
292.4

 
—

 
110.1

 
94.5

 
87.6

 
0.2