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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2015
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” on the Condensed Consolidated Balance Sheets (unaudited).

Changes in NiSource’s liability for asset retirement obligations for the three months ended March 31, 2015 and 2014 are presented in the table below:
 
(in millions)
2015
 
2014
Balance as of January 1,
$
159.4

 
$
174.4

Accretion expense
0.4

 
0.4

Accretion recorded as a regulatory asset/liability
1.9

 
2.1

Additions
—

 
0.1

Settlements
(0.7
)
 
(0.5
)
Change in estimated cash flows
(0.1
)
 
—

Balance as of March 31,
$
160.9

 
$
176.5