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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation [Abstract]  
Changes in AROs
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
Asset Retirement Obligations by line of business
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