XML 129 R12.htm IDEA: XBRL DOCUMENT v2.4.0.8
Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2013
Asset Retirement Obligation [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
Certain costs of removal that have been, and continue to be, included in depreciation rates and collected in the service rates of the rate-regulated subsidiaries are classified as “Regulatory liabilities and other removal costs” on the Condensed Consolidated Balance Sheets (unaudited).
Changes in NiSource’s liability for asset retirement obligations for the six months ended June 30, 2013 and 2012 are presented in the table below:
 
(in millions)
2013
 
2012
Balance as of January 1,
$
160.4

 
$
146.4

Accretion expense
0.6

 
0.5

Accretion recorded as a regulatory asset/liability
4.4

 
4.3

Additions
3.0

 
—

Settlements
(0.6
)
 
(1.5
)
Change in estimated cash flows
(0.7
)
 
—

Balance as of June 30,
$
167.1

 
$
149.7