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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation [Abstract]  
Changes in AROs
Changes in Questar's AROs from the Consolidated Balance Sheets were as follows:
 
Year Ended December 31,
 
2013
 
2012
 
(in millions)
AROs at beginning of year
$
67.2

 
$
63.8

Accretion
3.3

 
3.4

Liabilities incurred
6.0

 
3.1

Revisions in estimated cash flows
(6.9
)
 
(1.7
)
Liabilities settled
(1.9
)
 
(1.4
)
AROs at end of year
$
67.7

 
$
67.2
Asset Retirement Obligations by line of business
Questar's consolidated AROs by line of business are summarized in the table below:
 
December 31,
 
2013
 
2012
 
(in millions)
Questar Gas
$
0.6

 
$
0.5

Wexpro
64.9

 
64.6

Questar Pipeline
2.2

 
2.1

Total
$
67.7

 
$
67.2