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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2021
Long-term Debt, Current and Noncurrent [Abstract]  
Schedule of Long-Term Debt
Our long-term debt as of December 31, 2021 and 2020 is as follows:
Long-term debt type
Maturity as of December 31, 2021
Weighted average interest rate (%)
Outstanding balance as of December 31, (in millions)
20212020
Senior notes:
NiSourceAugust 20250.95 %1,250.0 1,250.0 
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 1,000.0 
NiSourceFebruary 20311.70 %750.0 750.0 
NiSourceDecember 20406.25 %152.6 152.6 
NiSourceJune 20415.95 %347.4 347.4 
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 $9,003.0 
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
6.37 %15.0 15.0 
Total medium term notes$132.0 $132.0 
Finance leases:
NiSource Corporate Services
March 2022 to December 2025
1.73 %51.4 49.4 
NIPSCO
December 2027 to January 2033
1.86 %18.7 16.0 
Columbia of Ohio
December 2025 to March 2044
6.15 %87.8 91.2 
Columbia of Virginia
July 2029 to November 2039
6.28 %17.7 18.4 
Columbia of Kentucky
May 2027
3.79 %0.2 0.3 
Columbia of Pennsylvania
August 2027 to May 2035
6.35 %9.8 19.7 
Total finance leases185.6 195.0 
Unamortized issuance costs and discounts$(79.1)$(86.9)
Total Long-Term Debt$9,241.5 $9,243.1