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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2020
Long-term Debt, Current and Noncurrent [Abstract]  
Schedule of 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)
20202019
Senior notes:
NiSourceDecember 20214.45 %— 63.6 
NiSourceNovember 20222.65 %— 500.0 
NiSourceFebruary 20233.85 %— 250.0 
NiSourceJune 20233.65 %— 350.0 
NiSourceAugust 20250.95 %1,250.0 — 
NiSourceNovember 20255.89 %— 265.0 
NiSourceMay 20273.49 %1,000.0 1,000.0 
NiSourceDecember 20276.78 %3.0 3.0 
NiSourceSeptember 20292.95 %750.0 750.0 
NiSourceMay 20303.60 %1,000.0 — 
NiSourceFebruary 20311.70 %750.0 — 
NiSourceDecember 20406.25 %152.6 250.0 
NiSourceJune 20415.95 %347.4 400.0 
NiSourceFebruary 20425.80 %250.0 250.0 
NiSourceFebruary 20435.25 %500.0 500.0 
NiSourceFebruary 20444.80 %750.0 750.0 
NiSourceFebruary 20455.65 %500.0 500.0 
NiSourceMay 20474.38 %1,000.0 1,000.0 
NiSourceMarch 20483.95 %750.0 750.0 
Total senior notes$9,003.0 $7,581.6 
Medium term notes:
NiSourceApril 2022 to May 20277.99 %$49.0 $49.0 
NIPSCOAugust 2022 to August 20277.61 %68.0 68.0 
Columbia of Massachusetts(1)
December 2025 to February 20286.37 %15.0 40.0 
Total medium term notes$132.0 $157.0 
Finance leases:
NiSource Corporate ServicesApril 2022 to January 20252.19 %49.4 22.3 
NIPSCONovember 20281.79 %16.0 — 
Columbia of OhioOctober 2021 to March 20446.16 %91.2 94.8 
Columbia of VirginiaJuly 2029 to November 20396.30 %18.4 19.1 
Columbia of KentuckyMay 20273.79 %0.3 0.3 
Columbia of PennsylvaniaAugust 2027 to May 20355.65 %19.7 20.7 
Columbia of MassachusettsN/A— %— 44.3 
Total finance leases195.0 201.5 
Unamortized issuance costs and discounts$(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.