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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | Recurring Fair Value Measurements. The following tables present financial assets and liabilities measured and recorded at fair value on NiSource’s Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of September 30, 2016 and December 31, 2015:
Recurring Fair Value Measurements September 30, 2016 (in millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance as of September 30, 2016
Assets |  |  |  |  |  |  |
Risk management assets | $ | 1.9 |  |  | $ | 5.7 |  |  | $ | — |  |  | $ | 7.6 |
Available-for-sale securities | — |  |  | 137.1 |  |  | — |  |  | 137.1 |
Total | $ | 1.9 |  |  | $ | 142.8 |  |  | $ | — |  |  | $ | 144.7 |
Liabilities |  |  |  |  |  |  |
Risk management liabilities(1) | $ | 4.5 |  |  | $ | 266.5 |  |  | $ | 0.1 |  |  | $ | 271.1 |
Total | $ | 4.5 |  |  | $ | 266.5 |  |  | $ | 0.1 |  |  | $ | 271.1 |
(1) Includes $6.6 million of current risk management liabilities which are included in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).
Recurring Fair Value Measurements December 31, 2015 (in millions) | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Balance as of December 31, 2015
Assets |  |  |  |  |  |  |
Risk management assets | $ | 0.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |
Available-for-sale securities | — |  |  | 128.7 |  |  | — |  |  | 128.7 |
Total | $ | 0.1 |  |  | $ | 128.7 |  |  | $ | — |  |  | $ | 128.8 |
Liabilities |  |  |  |  |  |  |
Risk management liabilities(1) | $ | 14.3 |  |  | $ | 17.4 |  |  | $ | 0.2 |  |  | $ | 31.9 |
Total | $ | 14.3 |  |  | $ | 17.4 |  |  | $ | 0.2 |  |  | $ | 31.9 |
(1) Includes $9.3 million of current risk management liabilities which are included in "Other accruals" on the Condensed Consolidated Balance Sheets (unaudited).
Schedule of Available-For-Sale Securities | The amortized cost, gross unrealized gains and losses and fair value of available-for-sale securities at September 30, 2016 and December 31, 2015 were:
September 30, 2016 (in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities |  |  |  |  |  |  |
U.S. Treasury securities | $ | 37.4 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | 38.3 |
Corporate/Other debt securities | 97.1 |  |  | 1.9 |  |  | (0.2 | ) |  | 98.8 |
Total Available-for-sale securities | $ | 134.5 |  |  | $ | 2.8 |  |  | $ | (0.2 | ) |  | $ | 137.1 |
December 31, 2015 (in millions) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities |  |  |  |  |  |  |
U.S. Treasury securities | $ | 33.7 |  |  | $ | 0.1 |  |  | $ | (0.3 | ) |  | $ | 33.5 |
Corporate/Other debt securities | 95.7 |  |  | 0.3 |  |  | (0.8 | ) |  | 95.2 |
Total Available-for-sale securities | $ | 129.4 |  |  | $ | 0.4 |  |  | $ | (1.1 | ) |  | $ | 128.7 |
Carrying Amount And Estimated Fair Values Of Financial Instruments | The carrying amount and estimated fair values of these financial instruments were as follows:
(in millions) | Carrying Amount as of September 30, 2016 |  | Estimated Fair Value as of September 30, 2016 |  | Carrying Amount as of Dec. 31, 2015 |  | Estimated Fair Value as of Dec. 31, 2015
Long-term debt (including current portion) | $ | 6,678.8 |  |  | $ | 7,639.9 |  |  | $ | 6,382.2 |  |  | $ | 6,975.7 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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