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Long-Term Debt | 12 Months Ended
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Dec. 31, 2020
Long-term Debt, Current and Noncurrent [Abstract] |
Long-Term Debt | Long-Term Debt Our long-term debt as of December 31, 2020 and 2019 is as follows:
Long-term debt type | Maturity as of December 31, 2020 | Weighted average interest rate (%) |  | Outstanding balance as of December 31, (in millions)
| 2020 |  | 2019
Senior notes: |  |  |  |  |  |
NiSource | December 2021 | 4.45 | % |  | — |  |  | 63.6 |
NiSource | November 2022 | 2.65 | % |  | — |  |  | 500.0 |
NiSource | February 2023 | 3.85 | % |  | — |  |  | 250.0 |
NiSource | June 2023 | 3.65 | % |  | — |  |  | 350.0 |
NiSource | August 2025 | 0.95 | % |  | 1,250.0 |  |  | — |
NiSource | November 2025 | 5.89 | % |  | — |  |  | 265.0 |
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 |  |  | — |
NiSource | February 2031 | 1.70 | % |  | 750.0 |  |  | — |
NiSource | December 2040 | 6.25 | % |  | 152.6 |  |  | 250.0 |
NiSource | June 2041 | 5.95 | % |  | 347.4 |  |  | 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 |  |  |  | $ | 9,003.0 |  |  | $ | 7,581.6 |
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(1) | December 2025 to February 2028 | 6.37 | % |  | 15.0 |  |  | 40.0 |
Total medium term notes |  |  |  | $ | 132.0 |  |  | $ | 157.0 |
Finance leases: |  |  |  |  |  |
NiSource Corporate Services | April 2022 to January 2025 | 2.19 | % |  | 49.4 |  |  | 22.3 |
NIPSCO | November 2028 | 1.79 | % |  | 16.0 |  |  | — |
Columbia of Ohio | October 2021 to March 2044 | 6.16 | % |  | 91.2 |  |  | 94.8 |
Columbia of Virginia | July 2029 to November 2039 | 6.30 | % |  | 18.4 |  |  | 19.1 |
Columbia of Kentucky | May 2027 | 3.79 | % |  | 0.3 |  |  | 0.3 |
Columbia of Pennsylvania | August 2027 to May 2035 | 5.65 | % |  | 19.7 |  |  | 20.7 |
Columbia of Massachusetts | N/A | — | % |  | — |  |  | 44.3 |
Total finance leases |  |  |  | 195.0 |  |  | 201.5 |
Unamortized issuance costs and discounts |  |  |  | $ | (86.9) |  |  | $ | (70.5) |
Total Long-Term Debt |  |  |  | $ | 9,243.1 |  |  | $ | 7,869.6 |
(1)Rate increased from 6.30% in 2019 to 6.37% in 2020 in connection with debt redemptions described below. Details of our 2020 long-term debt related activity are summarized below: •On April 13, 2020, we completed the issuance and sale of $1.0 billion of 3.60% senior unsecured notes maturing in 2030, which resulted in approximately $987.8 million of net proceeds after deducting commissions and expenses. •On August 18, 2020, we completed the issuance and sale of $1.25 billion of 0.95% senior unsecured notes maturing in 2025 and $750.0 million of 1.70% senior unsecured notes maturing in 2031, which resulted in approximately $1,980.4 million of net proceeds after deducting commissions and expenses. •In August 2020, we executed tender offers for $969.3 million of outstanding notes consisting of a combination of our 4.45% notes due 2021, 2.65% notes due 2022, 3.85% notes due 2023, 3.65% notes due 2023, 6.25% notes due 2040, and 5.95% notes due 2041. In August and September 2020, we redeemed $609.3 million of outstanding notes representing the remainder of our 4.45% notes due 2021, 2.65% notes due 2022, 3.85% notes due 2023, and 3.65% notes due 2023 and all of our 5.89% notes due 2025. In conjunction with the debt retired, we recorded a $231.8 million loss on early extinguishment of long-term debt, primarily attributable to early redemption premiums. •In September 2020, Columbia of Massachusetts redeemed $25.0 million of its outstanding 6.26% notes due 2028. In conjunction with the debt retired, Columbia of Massachusetts recorded an $11.7 million loss on early extinguishment of long-term debt, primarily attributable to early redemption premiums. Under the terms of the Asset Purchase Agreement, Columbia of Massachusetts’ net working capital at the closing of the sale of the Massachusetts Business was increased by 50% of the debt extinguishment costs, which was approximately $5.3 million. Details of our 2019 long-term debt related activity are summarized below: •On April 1, 2019, NIPSCO repaid $41.0 million of 5.85% pollution control bonds at maturity. •On August 12, 2019, we completed the issuance and sale of $750.0 million of 2.95% senior unsecured notes maturing in 2029 which resulted in approximately $742.4 million of net proceeds after deducting commissions and expenses. See Note 20-A, "Contractual Obligations," for the outstanding long-term debt maturities at December 31, 2020. Unamortized debt expense, premium and discount on long-term debt applicable to outstanding bonds are being amortized over the life of such bonds. We are subject to a financial covenant under our revolving credit facility which requires us to maintain a debt to capitalization ratio that does not exceed 70%. As of December 31, 2020, the ratio was 62.5%. We are also subject to certain other non-financial covenants under the revolving credit facility. Such covenants include a limitation on the creation or existence of new liens on our assets, generally exempting liens on utility assets, purchase money security interests, preexisting security interests and an additional subset of assets equal to $150 million. An asset sale covenant generally restricts the sale, conveyance, lease, transfer or other disposition of our assets to those dispositions that are for a price not materially less than fair market of such assets, that would not materially impair our ability to perform obligations under the revolving credit facility, and that together with all other such dispositions, would not have a material adverse effect. The covenant also restricts dispositions to no more than 10% of our consolidated total assets on December 31, 2015. The revolving credit facility also includes a cross-default provision, which triggers an event of default under the credit facility in the event of an uncured payment default relating to any indebtedness of us or any of our subsidiaries in a principal amount of $50.0 million or more. Our indentures generally do not contain any financial maintenance covenants. However, our indentures are generally subject to cross-default provisions ranging from uncured payment defaults of $5 million to $50 million, and limitations on the incurrence of liens on our assets, generally exempting liens on utility assets, purchase money security interests, preexisting security interests and an additional subset of assets capped at 10% of our consolidated net tangible assets.

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