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Asset Retirement Obligations (Notes)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations

Changes in Questar's AROs from the Consolidated Balance Sheets were as follows:
 
Year Ended December 31,
 
2015
 
2014
 
(in millions)
AROs at beginning of year
$
69.3

 
$
67.7

Accretion
3.3

 
3.4

Liabilities incurred
1.9

 
3.3

Revisions in estimated cash flows
1.8

 
(2.7
)
Liabilities settled
(8.7
)
 
(2.4
)
AROs at end of year
$
67.6

 
$
69.3



Questar's consolidated AROs by line of business are summarized in the table below:
 
December 31,
 
2015
 
2014
 
(in millions)
Questar Gas
$
0.6

 
$
0.6

Wexpro
64.6

 
66.3

Questar Pipeline
2.3

 
2.3

Other
0.1

 
0.1

Total
$
67.6

 
$
69.3



Wexpro collects from Questar Gas and deposits in trust certain funds related to estimated ARO costs. The funds are recorded as other noncurrent assets on the Consolidated Balance Sheets and are used to satisfy retirement obligations as the properties are abandoned. The accounting treatment of reclamation activities associated with AROs for properties administered under the Wexpro agreements is defined in a guideline letter between Wexpro and the Utah Division of Public Utilities and the staff of the PSCW.