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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation [Abstract]  
Changes in AROs
Changes in Questar's AROs from the Consolidated Balance Sheets were as follows:
 
Year Ended December 31,
 
2014
 
2013
 
(in millions)
AROs at beginning of year
$
67.7

 
$
67.2

Accretion
3.4

 
3.3

Liabilities incurred
3.3

 
6.0

Revisions in estimated cash flows
(2.7
)
 
(6.9
)
Liabilities settled
(2.4
)
 
(1.9
)
AROs at end of year
$
69.3

 
$
67.7
Asset Retirement Obligations by line of business
Questar's consolidated AROs by line of business are summarized in the table below:
 
December 31,
 
2014
 
2013
 
(in millions)
Questar Gas
$
0.6

 
$
0.6

Wexpro
66.3

 
64.9

Questar Pipeline
2.3

 
2.2

Other
0.1

 
—

Total
$
69.3

 
$
67.7