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Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2016
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations Changes in NiSource’s liability for asset retirement obligations for the nine months ended September 30, 2016 and 2015 are presented in the table below:
(in millions) | 2016 |  | 2015 |
Balance as of January 1, | $ | 254.0 |  |  | $ | 136.2 |  |
Accretion recorded as a regulatory asset/liability | 7.7 |  |  | 5.9 |  |
Additions | — |  |  | 6.4 |  |
Settlements | (2.2 | ) |  | (4.3 | ) |
Change in estimated cash flows | 12.8 |  | (1) | 37.0 |  | (2)
Balance as of September 30, | $ | 272.3 |  |  | $ | 181.2 |  |
(1) The change in estimated cash flows for 2016 is primarily attributed to changes in estimated costs for retirement of gas mains. (2) The change in estimated cash flows for 2015 primarily represents estimated costs associated with the EPA's final rule for regulation of CCRs and changes to cost estimates for certain solid waste management units. See Note 17, "Other Commitments and Contingencies," for additional information on CCRs.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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