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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2016
Asset Retirement Obligation [Abstract] |
Changes In Company's Liability For 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 Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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