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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2014
Asset Retirement Obligation [Abstract]  
Changes in AROs
Changes in Questar's AROs from the Condensed Consolidated Balance Sheets were as follows:
 
6 Months Ended
 
June 30,
 
2014
 
2013
 
(in millions)
AROs at beginning of year
$
67.7

 
$
67.2

Accretion
1.7

 
1.5

Liabilities incurred
0.5

 
1.3

Revisions in estimated cash flows
0.4

 
(6.8
)
Liabilities settled
(0.9
)
 
(0.8
)
AROs at June 30,
$
69.4

 
$
62.4