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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Long-Term Debt, Current and Noncurrent [Abstract] |
Schedule of Long-Term Debt | Our long-term debt as of December 31, 2022 and 2021 is as follows:
Long-term debt type | Maturity as of December 31, 2022 | Weighted average interest rate (%) |  | Outstanding balance as of December 31, (in millions)
| 2022 |  | 2021
Senior notes: |  |  |  |  |  |
NiSource | August 2025 | 0.95 | % |  | $ | 1,250.0 |  |  | 1,250.0 |
NiSource | May 2027 | 3.49 | % |  | 1,000.0 |  |  | 1,000.0 |
NiSource | December 2027 | 6.78 | % |  | 3.0 |  |  | 3.0 |
NiSource | September 2029 | 2.95 | % |  | 750.0 |  |  | 750.0 |
NiSource | May 2030 | 3.60 | % |  | 1,000.0 |  |  | 1,000.0 |
NiSource | February 2031 | 1.70 | % |  | 750.0 |  |  | 750.0 |
NiSource | December 2040 | 6.25 | % |  | 152.6 |  |  | 152.6 |
NiSource | June 2041 | 5.95 | % |  | 347.4 |  |  | 347.4 |
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 |
NiSource | June 2052 | 5.00 | % |  | 350.0 |  |  | $ | — |
Total senior notes |  |  |  | $ | 9,353.0 |  |  | $ | 9,003.0 |
Medium term notes: |  |  |  |  |  |
NiSource | May 2027 | 7.99 | % |  | $ | 29.0 |  |  | $ | 49.0 |
NIPSCO | June 2027 to August 2027 | 7.64 | % |  | 58.0 |  |  | 68.0 |
Columbia of Massachusetts | December 2025 to February 2028 | 6.37 | % |  | 15.0 |  |  | 15.0 |
Total medium term notes |  |  |  | $ | 102.0 |  |  | $ | 132.0 |
Finance leases: |  |  |  |  |  |
NiSource Corporate Services | December 2022 to December 2026 | 2.34 | % |  | $ | 48.6 |  |  | 51.4 |
NIPSCO | December 2027 to November 2035 | 1.87 | % |  | 16.5 |  |  | 18.7 |
Columbia of Ohio | December 2025 to March 2044 | 6.15 | % |  | 83.5 |  |  | 87.8 |
Columbia of Virginia | July 2029 to November 2039 | 6.26 | % |  | 17.0 |  |  | 17.7 |
Columbia of Kentucky | May 2027 | 3.79 | % |  | 0.2 |  |  | 0.2 |
Columbia of Pennsylvania | July 2027 to May 2035 | 6.28 | % |  | 8.9 |  |  | 9.8 |
Total finance leases |  |  |  | $ | 174.7 |  |  | 185.6 |
Unamortized issuance costs and discounts |  |  |  | $ | (76.1) |  |  | $ | (79.1) |
Total Long-Term Debt |  |  |  | $ | 9,553.6 |  |  | $ | 9,241.5 |

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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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