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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2011
Earnings Per Common Share Attributable to Questar [Abstract] 
Reconciliation of the components of basic and diluted shares in EPS calculations
A reconciliation of the components of basic and diluted shares used in the EPS calculation follows:

 
3 Months Ended
Sept. 30,
9 Months Ended
Sept. 30,
12 Months Ended
Sept. 30,
 
2011
2010
2011
2010
2011
2010
 
(in millions)
Weighted-average basic common shares outstanding
177.5 
175.5 
177.3 
175.2 
177.1 
174.9 
Potential number of shares issuable under the Company's LTSIP
1.4 
2.7 
1.4 
2.5 
1.7 
2.4 
Weighted average diluted common shares outstanding
178.9 
178.2 
178.7 
177.7 
178.8 
177.3