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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Long-term Debt, Current and Noncurrent [Abstract] |
Schedule of Long-Term Debt | Our long-term debt as of December 31, 2018 and 2017 is as follows:
Long-term debt type | Maturity as of December 31, 2018 | Weighted average interest rate (%) |  | Outstanding balance as of December 31, (in millions)
| 2018 |  | 2017
Senior notes: |  |  |  |  |  |
NiSource | March 2018 | 6.40 | % |  | — |  |  | 275.1 |
NiSource | January 2019 | 6.80 | % |  | — |  |  | 255.1 |
NiSource | September 2020 | 5.45 | % |  | — |  |  | 325.1 |
NiSource | December 2021 | 4.45 | % |  | 63.6 |  |  | 63.6 |
NiSource | March 2022 | 6.13 | % |  | — |  |  | 180.0 |
NiSource | November 2022 | 2.65 | % |  | 500.0 |  |  | 500.0 |
NiSource | February 2023 | 3.85 | % |  | 250.0 |  |  | 250.0 |
NiSource | June 2023 | 3.65 | % |  | 350.0 |  |  | — |
NiSource | November 2025 | 5.89 | % |  | 265.0 |  |  | 265.0 |
NiSource | May 2027 | 3.49 | % |  | 1,000.0 |  |  | 1,000.0 |
NiSource | December 2027 | 6.78 | % |  | 3.0 |  |  | 3.0 |
NiSource | December 2040 | 6.25 | % |  | 250.0 |  |  | 250.0 |
NiSource | June 2041 | 5.95 | % |  | 400.0 |  |  | 400.0 |
NiSource | February 2042 | 5.80 | % |  | 250.0 |  |  | 250.0 |
NiSource | February 2043 | 5.25 | % |  | 500.0 |  |  | 500.0 |
NiSource | February 2044 | 4.80 | % |  | 750.0 |  |  | 750.0 |
NiSource | February 2045 | 5.65 | % |  | 500.0 |  |  | 500.0 |
NiSource | May 2047 | 4.38 | % |  | 1,000.0 |  |  | 1,000.0 |
NiSource | March 2048 | 3.95 | % |  | 750.0 |  |  | 750.0 |
Total senior notes |  |  |  | $ | 6,831.6 |  |  | $ | 7,516.9 |
Medium term notes: |  |  |  |  |  |
NiSource | April 2022 to May 2027 | 7.99 | % |  | $ | 49.0 |  |  | $ | 49.0 |
NIPSCO | August 2022 to August 2027 | 7.61 | % |  | 68.0 |  |  | 68.0 |
Columbia of Massachusetts | December 2025 to February 2028 | 6.30 | % |  | 40.0 |  |  | 40.0 |
Total medium term notes |  |  |  | $ | 157.0 |  |  | $ | 157.0 |
Capital leases: |  |  |  |  |  |
NIPSCO | May 2018 | 3.95 | % |  | $ | — |  |  | $ | 3.8 |
NiSource Corporate Services | January 2019 to October 2022 | 3.68 | % |  | 11.6 |  |  | 1.4 |
Columbia of Ohio | October 2021 to June 2038 | 6.33 | % |  | 91.5 |  |  | 88.5 |
Columbia of Virginia | July 2029 to December 2037 | 7.12 | % |  | 15.2 |  |  | 5.2 |
Columbia of Kentucky | May 2027 | 3.79 | % |  | 0.3 |  |  | 0.4 |
Columbia of Pennsylvania | August 2027 to June 2036 | 5.42 | % |  | 30.0 |  |  | 31.0 |
Columbia of Massachusetts | December 2033 to November 2043 | 5.48 | % |  | 45.7 |  |  | 22.8 |
Total capital leases |  |  |  | 194.3 |  |  | 153.1 |
Pollution control bonds - NIPSCO | April 2019 | 5.85 | % |  | 41.0 |  |  | 41.0 |
Unamortized issuance costs and discounts |  |  |  | (68.5 | ) |  | $ | (71.5 | )
Total Long-Term Debt |  |  |  | $ | 7,155.4 |  |  | $ | 7,796.5 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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