XML 39 R22.htm IDEA: XBRL DOCUMENT v2.4.0.8
Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2014
Asset Retirement Obligation [Abstract]  
Changes in AROs
Changes in Questar's AROs from the Condensed Consolidated Balance Sheets were as follows:
 
3 Months Ended
 
March 31,
 
2014
 
2013
 
(in millions)
AROs at beginning of year
$
67.7

 
$
67.2

Accretion
0.8

 
0.8

Liabilities incurred
0.4

 
0.4

Revisions in estimated cash flows
0.4

 
(6.8
)
Liabilities settled
(0.7
)
 
(0.4
)
AROs at March 31,
$
68.6

 
$
61.2