XML 31 R20.htm IDEA: XBRL DOCUMENT v3.5.0.2
Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation [Abstract]  
Schedule of Changes in AROs
Changes in Questar Gas' AROs from the Condensed Balance Sheets were as follows:
 
9 Months Ended
 
September 30,
 
2016
 
2015
 
(in millions)
AROs at beginning of year
$
0.6

 
$
0.6

Accretion
0.7

 
—

Revisions in estimated cash flows
75.1

 
—

Liabilities settled
(0.3
)
 
—

AROs at end of period
$
76.1

 
$
0.6