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Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2024

Long-Term Debt, Current and Noncurrent [Abstract]

Schedule of Long-Term Debt

Our long-term debt as of December 31, 2024 and 2023 is as follows:


Long-term debt type			Maturity as of December 31, 2024			Weighted average interest rate (%)						Outstanding balance as of December 31, (in millions)
												2024						2023
Senior notes:
NiSource			August 2025			0.950		%				$	1,250.0					$	1,250.0
NiSource			May 2027			3.490		%				1,000.0						1,000.0
NiSource			December 2027			6.780		%				3.0						3.0
NiSource			March 2028			5.250		%				1,050.0						1,050.0
NiSource			July 2029			5.200		%				600.0						—
NiSource			September 2029			2.950		%				750.0						750.0
NiSource			May 2030			3.600		%				1,000.0						1,000.0
NiSource			February 2031			1.700		%				750.0						750.0
NiSource			June 2033			5.400		%				450.0						450.0
NiSource			April 2034			5.350		%				650.0						—
NiSource			December 2040			6.250		%				152.6						152.6
NiSource			June 2041			5.950		%				347.4						347.4
NiSource			February 2042			5.800		%				250.0						250.0
NiSource			February 2043			5.250		%				500.0						500.0
NiSource			February 2044			4.800		%				750.0						750.0
NiSource			February 2045			5.650		%				500.0						500.0
NiSource			May 2047			4.375		%				1,000.0						1,000.0
NiSource			March 2048			3.950		%				750.0						750.0
NiSource			June 2052			5.000		%				350.0						350.0
Total senior notes												$	12,103.0					$	10,853.0
Junior subordinated notes:
NiSource			November 2054			6.950		%				500.0						—
NiSource			March 2055			6.375		%				500.0						—
Total junior subordinated notes												$	1,000.0					$	—
Medium term notes:
NiSource			May 2027			7.990		%				$	29.0					$	29.0
NIPSCO			June 2027 to August 2027			7.644		%				58.0						58.0
Columbia of Massachusetts			December 2025 to February 2028			6.373		%				15.0						15.0
Total medium term notes												$	102.0					$	102.0
Finance leases:
NiSource Corporate Services			January 2025 to September 2027			3.470		%				$	14.6					$	30.5
NIPSCO			December 2027 to November 2035			5.250		%				124.3						61.2
Columbia of Ohio			December 2025 to March 2044			6.150		%				85.6						90.3
Columbia of Virginia			July 2029 to November 2039			6.190		%				15.2						16.1
Columbia of Kentucky			May 2027			5.360		%				0.1						0.2
Columbia of Pennsylvania			July 2027 to May 2035			4.470		%				6.4						7.1
Total finance leases												$	246.2					$	205.4
Less: Unamortized issuance costs and discounts												(95.5)						(81.1)
Less: Current portion of long term debt												(1,281.2)						(23.8)
Total Long-Term Debt												$	12,074.5					$	11,055.5