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Long-Term Debt (Tables)
 12 Months Ended
Dec. 31, 2023
Long-Term Debt, Current and Noncurrent [Abstract]  
Schedule of Long-Term Debt
Our long-term debt as of December 31, 2023 and 2022 is as follows:
Long-term debt type
Maturity as of December 31, 2023
Weighted average interest rate (%)
Outstanding balance as of December 31, (in millions)
20232022
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 
NiSource
March 20285.25 %1,050.0— 
NiSourceSeptember 20292.95 %750.0 750.0 
NiSourceMay 20303.60 %1,000.0 1,000.0 
NiSourceFebruary 20311.70 %750.0 750.0 
NiSource
June 20335.40 %450.0— 
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 
NiSourceJune 20525.00 %350.0 350.0 
Total senior notes$10,853.0 $9,353.0 
Medium term notes:
NiSource
May 2027
7.99 %$29.0 $29.0 
NIPSCO
June 2027 to August 2027
7.64 %58.0 58.0 
Columbia of Massachusetts
December 2025 to February 2028
6.37 %15.0 15.0 
Total medium term notes$102.0 $102.0 
Finance leases:
NiSource Corporate Services
February 2024 to September 2027
2.89 %$30.5 $48.6 
NIPSCO
December 2027 to November 2035
4.77 %61.2 16.5 
Columbia of Ohio
December 2025 to March 2044
6.16 %90.3 83.5 
Columbia of Virginia
July 2029 to November 2039
6.23 %16.1 17.0 
Columbia of Kentucky
May 2027
3.79 %0.2 0.2 
Columbia of Pennsylvania
July 2027 to May 2035
4.49 %7.1 8.9 
Total finance leases$205.4 $174.7 
Unamortized issuance costs and discounts$(81.1)$(76.1)
Total Long-Term Debt$11,079.3 $9,553.6