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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2015
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,
 
2015
 
2014
 
(in millions)
AROs at beginning of year
$
69.3

 
$
67.7

Accretion
1.7

 
1.7

Liabilities incurred
0.5

 
0.5

Revisions in estimated cash flows
5.7

 
0.4

Liabilities settled
(6.6
)
 
(0.9
)
AROs at end of period
$
70.6

 
$
69.4