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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]  
Summary of unaudited quarterly financial information
Following is a summary of unaudited quarterly financial information:
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
 
Year
 
(in millions, except per-share amounts)
2012
 
 
 
 
 
 
 
 
 
Revenues  
$
425.7

 
$
188.4

 
$
141.8

 
$
343.0

 
$
1,098.9

Operating income
130.9

 
72.6

 
63.6

 
108.6

 
375.7

Net income attributable to Questar
75.2

 
39.2

 
33.8

 
63.8

 
212.0

Basic EPS attributable to Questar
$
0.42

 
$
0.22

 
$
0.20

 
$
0.36

 
$
1.20

Diluted EPS attributable to Questar
0.42

 
0.22

 
0.19

 
0.36

 
1.19

 
 
 
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
Revenues  
$
470.0

 
$
222.9

 
$
146.7

 
$
354.8

 
$
1,194.4

Operating income
122.8

 
73.7

 
63.8

 
106.6

 
366.9

Net income attributable to Questar
69.9

 
40.3

 
36.1

 
61.6

 
207.9

Basic EPS attributable to Questar
$
0.40

 
$
0.22

 
$
0.21

 
$
0.34

 
$
1.17

Diluted EPS attributable to Questar
0.39

 
0.22

 
0.20

 
0.34

 
1.16