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Pension and Other Postretirement Benefits
 12 Months Ended
Dec. 31, 2023
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Pension and Other Postretirement Benefits
We provide defined contribution plans and noncontributory defined benefit retirement plans that cover certain of our employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, we provide health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for us. The expected cost of such benefits is accrued during the employees’ years of service. Current rates of rate-regulated companies include postretirement benefit costs, including amortization of the regulatory assets that arose prior to inclusion of these costs in rates. For most plans, cash contributions are remitted to grantor trusts.
Our Pension and Other Postretirement Benefit Plans’ Asset Management. The Board has delegated oversight of the pension and other postretirement benefit plans’ assets to the NiSource Benefits Committee (“the Committee”). The Committee has adopted investment policy statements for the pension and other postretirement benefit plans’ assets. For the pension plans, we employ a liability-driven investing strategy. A total return approach is utilized for the other postretirement benefit plans’ assets. A mix of diversified investments are used to maximize the long-term return of plan assets and hedge the liabilities at a prudent level of risk. The investment portfolio includes U.S. and non-U.S. equities, real estate, long-term and intermediate-term fixed income and alternative investments. Risk tolerance is established through careful consideration of plan liabilities, funded status, and asset class volatility. Investment risk is measured and monitored on an ongoing basis through quarterly investment portfolio reviews, annual liability measurements, and periodic asset/liability studies.
In determining the expected long-term rate of return on plan assets, historical markets are studied, relationships between equities and fixed income are analyzed and current market factors, such as inflation and interest rates are evaluated with consideration of diversification and rebalancing. Our expected long-term rate of return on assets is based on assumptions regarding target asset allocations and corresponding long-term capital market assumptions for each asset class. The pension plans’ investment policy calls for a gradual reduction in the allocation of return-seeking assets (equities, real estate and private equity) and a corresponding increase in the allocation of liability-hedging assets (fixed income) as the funded status of the plans’ increase.
As of December 31, 2023 and December 31, 2022, the acceptable minimum and maximum ranges established by the policy for the pension and other postretirement benefit plans are as follows:
December 31, 2023
Defined Benefit Pension PlanPostretirement Benefit Plan
Asset CategoryMinimumMaximumMinimumMaximum
Domestic Equities10%30%0%55%
International Equities5%15%0%25%
Fixed Income65%75%20%100%
Real Estate0%0%0%0%
Private Equity0%3%0%0%
Short-Term Investments0%10%0%10%

December 31, 2022
Defined Benefit Pension PlanPostretirement Benefit Plan
Asset CategoryMinimumMaximumMinimumMaximum
Domestic Equities7%27%0%55%
International Equities3%13%0%25%
Fixed Income69%81%20%100%
Real Estate0%3%0%0%
Private Equity0%3%0%0%
Short-Term Investments0%10%0%10%
The actual Pension Plan and Postretirement Plan Asset Mix at December 31, 2023 and December 31, 2022 are as follows:
Defined Benefit
Pension Assets(1)
December 31,
2023		Postretirement
Benefit Plan Assets		December 31,
2023
Asset Class (in millions)
Asset Value% of Total AssetsAsset Value% of Total Assets
Domestic Equities$261.7 18.3 %$93.7 39.6 %
International Equities141.9 9.9 %40.7 17.2 %
Fixed Income939.9 65.9 %97.0 41.0 %
Real Estate4.0 0.3 %— — 
Cash/Other79.3 5.6 %5.1 2.2 %
Total$1,426.8 100.0 %$236.5 100.0 %
    
Defined Benefit Pension Assets(1)
December 31,
2022		Postretirement Benefit Plan AssetsDecember 31,
2022
Asset Class (in millions)
Asset Value% of Total AssetsAsset Value% of Total Assets
Domestic Equities$231.1 16.2 %$86.9 38.6 %
International Equities119.0 8.4 %36.6 16.3 %
Fixed Income1,004.3 70.6 %94.7 42.1 %
Real Estate5.0 0.3 %— — 
Cash/Other63.4 4.5 %6.7 3.0 %
Total$1,422.8 100.0 %$224.9 100.0 %
(1)Total includes accrued dividends and pending trades with brokers.
The categorization of investments into the asset classes in the tables above are based on definitions established by the Committee.
Fair Value Measurements. The following table sets forth, by level within the fair value hierarchy, the pension and other postretirement benefits investment assets at fair value as of December 31, 2023 and 2022. Assets are classified in their entirety based on the observability of inputs used in determining the fair value measurement. There were no investment assets in the pension and other postretirement benefits trusts classified within Level 3 for the years ended December 31, 2023 and 2022.
We use the following valuation techniques to determine fair value. For the year ended December 31, 2023, there were no significant changes to valuation techniques to determine the fair value of our pension and other postretirement benefits' assets.
Level 1 Measurements
Most common and preferred stocks are traded in active markets on national and international securities exchanges and are valued at closing prices on the last business day of each period presented. Cash is stated at cost, which approximates fair value, with the exception of cash held in foreign currencies which fluctuates with changes in the exchange rates. Short-term bills and notes are priced based on quoted market values.
Level 2 Measurements
Most U.S. Government Agency obligations, mortgage/asset-backed securities, and corporate fixed income securities are generally valued by benchmarking model-derived prices to quoted market prices and trade data for identical or comparable securities. To the extent that quoted prices are not available, fair value is determined based on a valuation model that includes inputs such as interest rate yield curves and credit spreads. Securities traded in markets that are not considered active are valued based on quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Other fixed income includes futures and options which are priced on bid valuation or settlement pricing.
Level 3 Measurements
Investments with unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets and liabilities are classified as level 3 investments.
Not Classified
Commingled funds, private equity limited partnerships and real estate partnerships are not classified within the fair value hierarchy. Instead, these assets are measured at estimated fair value using the net asset value per share of the investments. Commingled funds' underlying assets are principally marketable equity and fixed income securities. Units held in commingled funds are valued at the unit value as reported by the investment managers. Private equity funds invest capital in non-public companies and real estate funds invest in commercial and distressed real estate directly or through related debt instruments. The fair value of these investments is determined by reference to the funds’ underlying assets.
Fair Value Measurements at December 31, 2023: 
(in millions)December 31,
2023		Quoted Prices in  Active Markets for
 Identical Assets
(Level 1)		Significant Other
Observable Inputs (Level 2)		Significant
Unobservable Inputs
 (Level 3)
Pension plan assets:
Cash$2.2 $2.0 $0.2 $— 
Equity securities
International equities1.1 1.1 — — 
Fixed income securities
Government213.1 — 213.1 — 
Corporate482.2 — 482.2 — 
Mortgages/ Asset Backed Securities2.4 — 2.4 — 
Mutual Funds
U.S. multi-strategy113.1 113.1 — — 
International equities38.5 38.5 — — 
Private equity limited partnerships(1)
U.S. multi-strategy(2)
4.8 — — — 
International multi-strategy(3)
1.2 — — — 
Distressed opportunities0.1 — — — 
Real estate(1)
4.0 — — — 
Commingled funds(1)
Short-term money markets65.3 — — — 
U.S. equities148.5 — — — 
International equities102.3 — — — 
Fixed income242.2 — — — 
Pension plan assets subtotal$1,421.0 $154.7 $697.9 $— 
Other postretirement benefit plan assets:
Mutual funds
U.S. multi-strategy82.4 82.4 — — 
International equities18.0 18.0 — — 
Fixed income97.0 97.0 — — 
Commingled funds(1)
Short-term money markets5.2 — — — 
U.S. equities11.4 — — — 
International equities22.8 — — — 
Other postretirement benefit plan assets subtotal$236.8 $197.4 $— $— 
Due to brokers, net(4)
(2.7)— (2.7)— 
Accrued income/dividends8.5 8.5 — 
Total pension and other postretirement benefit plan assets$1,663.6 $360.6 $695.2 $— 
(1))This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy.
(2)This class includes limited partnerships that invest in a diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily inside the United States. 
(3)This class includes limited partnerships that invest a in diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily outside the United States.
(4)This class represents pending trades with brokers.
The table below sets forth a summary of unfunded commitments, redemption frequency and redemption notice periods for certain investments that are measured at fair value using the net asset value per share for the year ended December 31, 2023:
(in millions)Fair ValueUnfunded CommitmentsRedemption FrequencyRedemption Notice Period
Commingled Funds
Short-term money markets$70.5 $— Daily1 day
U.S. equities159.9 — Daily
1 day - 5 days
International equities125.1 — Monthly
10 days-30 days
Fixed income242.2 — Daily3 days
Private Equity and Real Estate Limited Partnerships(1)
10.1 11.6 N/AN/A
Total$607.8 $11.6 
(1)Private equity and real estate limited partnerships typically call capital over a 3-5 year period and pay out distributions as the underlying investments are liquidated. The typical expected life of these limited partnerships is 0-15 years, and these investments typically cannot be redeemed prior to liquidation.
Fair Value Measurements at December 31, 2022:
(in millions)December 31,
2022		Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other
Observable Inputs (Level 2)		Significant
Unobservable Inputs 
(Level 3)
Pension plan assets:
Cash$2.5 $2.0 $0.5 $— 
Equity securities
International equities0.5 0.5 — — 
Fixed income securities
Government316.3 — 316.3 — 
Corporate407.8 — 407.8 — 
Mortgages/Asset backed securities2.3 — 2.3 — 
Other fixed income1.9 1.9 — — 
Mutual Funds
U.S. multi-strategy97.4 97.4 — — 
International equities29.0 29.0 — — 
Fixed income0.2 0.2 — — 
Private equity limited partnerships(1)
U.S. multi-strategy(2)
6.3 — — — 
International multi-strategy(3)
2.3 — — — 
Distressed opportunities0.1 — — — 
Real estate(1)
5.0 — — — 
Commingled funds(1)
Short-term money markets46.2 — — — 
U.S. equities133.7 — — — 
International equities89.6 — — — 
Fixed income275.9 — — — 
Pension plan assets subtotal$1,417.0 $131.0 $726.9 $— 
Other postretirement benefit plan assets:
Mutual funds
U.S. multi-strategy76.2 76.2 — — 
International equities16.3 16.3 — — 
Fixed income94.7 94.7 — — 
Commingled funds(1)
Short-term money markets17.4 — — — 
U.S. equities10.7 — — — 
International equities20.3 — — — 
Other postretirement benefit plan assets subtotal$235.6 $187.2 $— $— 
Due to brokers, net(4)
(2.0)— (2.0)— 
Receivables/payables(10.7)— (10.7)— 
Accrued income/dividends7.8 7.8 — — 
Total pension and other postretirement benefit plan assets$1,647.7 $326.0 $714.2 $— 
(1)This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy.
(2)This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily inside the United States. 
(3)This class includes limited partnerships/fund of funds that invest in diverse portfolio of private equity strategies, including buy-outs, growth capital, special situations and secondary markets, primarily outside the United States.
(4)This class represents pending trades with brokers.

The table below sets forth a summary of unfunded commitments, redemption frequency and redemption notice periods for certain investments that are measured at fair value using the net asset value per share for the year ended December 31, 2022:
(in millions)Fair ValueUnfunded CommitmentsRedemption FrequencyRedemption Notice Period
Commingled Funds
Short-term money markets$63.6 $— Daily1 day
U.S. equities144.4 — Daily
1 day -5 days
International equities109.9 — Monthly
10 days - 30 days
Fixed income275.9 — Daily3 days
Private Equity and Real Estate Limited Partnerships(1)
13.7 11.6 N/AN/A
Total$607.5 $11.6 
(1)Private equity and real estate limited partnerships typically call capital over a 3-5 year period and pay out distributions as the underlying investments are liquidated. The typical expected life of these limited partnerships is 0-15 years, and these investments typically cannot be redeemed prior to liquidation.
 
Our Pension and Other Postretirement Benefit Plans’ Funded Status and Related Disclosure. The following table provides a reconciliation of the plans’ funded status and amounts reflected in our Consolidated Balance Sheets at December 31 based on a December 31 measurement date:
 Pension BenefitsOther Postretirement Benefits
(in millions)2023202220232022
Change in projected benefit obligation(1)
Benefit obligation at beginning of year$1,427.4 $1,852.4 $449.0 $556.2 
Service cost20.5 27.8 5.1 6.5 
Interest cost68.4 40.5 21.8 12.0 
Plan participants’ contributions— — 4.2 4.1 
Plan amendments— 0.2 3.4 2.1 
Actuarial loss (gain)(2)
27.4 (318.7)29.1 (89.9)
Benefits paid(141.9)(174.8)(44.3)(42.3)
Estimated benefits paid by incurred subsidy— — 0.5 0.3 
Projected benefit obligation at end of year$1,401.8 $1,427.4 $468.8 $449.0 
Change in plan assets
Fair value of plan assets at beginning of year$1,422.8 $1,981.7 $224.9 $293.7 
Actual return on plan assets142.8 (386.8)28.2 (51.9)
Employer contributions3.1 2.7 23.4 21.3 
Plan participants’ contributions— — 4.3 4.1 
Benefits paid(141.9)(174.8)(44.3)(42.3)
Fair value of plan assets at end of year$1,426.8 $1,422.8 $236.5 $224.9 
Funded Status at end of year$25.0 $(4.6)$(232.3)$(224.1)
Amounts recognized in the statement of financial position consist of:
Noncurrent assets44.1 18.3 — — 
Current liabilities(2.2)(2.6)(1.0)(1.0)
Noncurrent liabilities(16.9)(20.3)(231.3)(223.1)
Net amount recognized at end of year(3)
$25.0 $(4.6)$(232.3)$(224.1)
Amounts recognized in accumulated other comprehensive income or regulatory asset/liability(4)
Unrecognized prior service credit$0.3 $0.4 $2.1 $(3.4)
Unrecognized actuarial loss500.4 564.2 76.6 64.0 
 Net amount recognized at end of year$500.7 $564.6 $78.7 $60.6 
(1)The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in accumulated postretirement benefit obligation.
(2)The pension actuarial loss (gain) was primarily driven by the decrease in discount rates, interest rate movements. The postretirement benefit actuarial loss (gain) was also primarily driven by a decrease in discount rates and claims experience changes in trend rates.
(3)We recognize our Consolidated Balance Sheets underfunded and overfunded status of our various defined benefit postretirement plans, measured as the difference between the fair value of the plan assets and the benefit obligation.
(4)We determined that for certain rate-regulated subsidiaries the future recovery of pension and other postretirement benefits costs is probable. These rate-regulated subsidiaries recorded regulatory assets and liabilities of $561.6 million and zero, respectively, as of December 31, 2023, and $607.5 million and zero, respectively, as of December 31, 2022 that would otherwise have been recorded to accumulated other comprehensive loss.
Our accumulated benefit obligation for our pension plans was $1,390.9 million and $1,416.8 million as of December 31, 2023 and 2022, respectively. The accumulated benefit obligation at each date is the actuarial present value of benefits attributed by the pension benefit formula to employee service rendered prior to that date and based on current and past compensation levels. The accumulated benefit obligation differs from the projected benefit obligation disclosed in the table above in that it includes no assumptions about future compensation levels. 
We are required to reflect the funded status of our pension and postretirement benefit plans on the Consolidated Balance Sheet. The funded status of the plans is measured as the difference between the plan assets' fair value and the projected benefit obligation. We present the noncurrent aggregate of all underfunded plans within "Accrued liability for postretirement and postemployment benefits." The portion of the amount by which the actuarial present value of benefits included in the projected
benefit obligation exceeds the fair value of plan assets, payable in the next 12 months, is reflected in "Accrued compensation and other benefits." We present the aggregate of all overfunded plans within "Deferred charges and other."
As of December 31, 2023 and 2022, only our nonqualified plans were underfunded. These plans have no assets as they are not funded until benefits are paid. The following table sets forth the year end accumulated benefit obligation and projected benefit obligation for pension plans with a projected benefit obligation in excess of plan assets:
December 31,
20232022
Accumulated Benefit Obligation$19.1 $22.9 
Funded Status
Fair Value of Plan Assets$— $— 
Projected Benefit Obligation19.1 22.9 
Funded Status of Underfunded Pension Plans at End of Year
$(19.1)$(22.9)
The following table sets forth the year end accumulated benefit obligation, projected benefit obligation and fair value of plan assets for pension plans with plan assets in excess of the projected benefit obligation:
December 31,
20232022
Accumulated Benefit Obligation$1,371.8 $1,393.8 
Funded Status
Fair Value of Plan Assets$1,426.8 $1,422.8 
Projected Benefit Obligation1,382.7 1,404.5 
Funded Status of Overfunded Pension Plans at End of Year$44.1 $18.3 
Our pension plans were overfunded, in aggregate, by $25.0 million at December 31, 2023 compared to being underfunded by $4.6 million at December 31, 2022. The improvement in the funded status was primarily due to favorable asset returns offset by a decrease in discount rates. We contributed $3.1 million and $2.7 million to our pension plans in 2023 and 2022, respectively.
Our other postretirement benefit plans were underfunded, in aggregate by $232.3 million and $224.1 million at December 31, 2023 and 2022, respectively. The decline in funded status was primarily due to increased health care trend rates and discount rates, which was partially offset by actual return on plan assets exceeding expected return. We contributed $23.4 million and $21.3 million to our other postretirement benefit plans in 2023 and 2022, respectively.
In 2023 and 2022, our NiSource Pension Restoration and Columbia Energy Group pension plans paid lump sum payouts in excess of the respective plan's service cost plus interest cost, thereby meeting the requirement for settlement accounting. We recorded settlement charges of $9.2 million and $12.4 million in 2023 and 2022, respectively. Net periodic pension benefit cost increased by $5.7 million in December 31, 2022 as the result of the remeasurement. In 2023, no remeasurement occurred related to lump sum payouts.
The following table provides the key assumptions that were used to calculate the pension and other postretirement benefits obligations for our various plans as of December 31:
 Pension BenefitsOther Postretirement  Benefits
  
2023202220232022
Weighted-average assumptions to Determine Benefit Obligation
Discount Rate4.95 %5.14 %4.98 %5.17 %
Rate of Compensation Increases4.00 %4.00 %N/AN/A
Interest Crediting Rates4.00 %4.00 %N/AN/A
Health Care Trend Rates
Trend for Next YearN/AN/A8.84 %6.69 %
Ultimate TrendN/AN/A4.75 %4.75 %
Year Ultimate Trend ReachedN/AN/A20322032
We expect to make contributions of approximately $2.2 million to our pension plans and approximately $23.1 million to our postretirement medical and life plans in 2024.
The following table provides benefits expected to be paid in each of the next five fiscal years, and in the aggregate for the five fiscal years thereafter. The expected benefits are estimated based on the same assumptions used to measure our benefit obligation at the end of the year and include benefits attributable to the estimated future service of employees:
(in millions)Pension BenefitsOther
Postretirement Benefits		Federal
Subsidy Receipts
Year(s)
2024$144.8 $38.1 $0.2 
2025141.8 38.1 0.2 
2026135.0 37.5 0.2 
2027129.4 37.4 0.2 
2028125.1 37.0 0.2 
2028-2032548.0 176.0 0.9 
The following table provides the components of the plans’ actuarially determined net periodic benefits cost for each of the three years ended December 31, 2023, 2022 and 2021:
 Pension BenefitsOther Postretirement
Benefits
(in millions)202320222021202320222021
Components of Net Periodic Benefit (Income) Cost(1)
Service cost$20.5 $27.8 $30.2 $5.1 $6.5 $6.2 
Interest cost68.4 40.5 31.4 21.8 12.0 9.9 
Expected return on assets(94.5)(90.8)(101.6)(15.1)(16.2)(15.3)
Amortization of prior service cost (credit)0.1 0.1 0.1 (2.1)(2.2)(2.2)
Recognized actuarial loss33.7 20.3 21.7 3.3 2.6 4.6 
Settlement loss
9.2 12.4 11.4 — — — 
Total Net Periodic Benefits (Income) Cost$37.4 $10.3 $(6.8)$13.0 $2.7 $3.2 
(1)Service cost is presented in "Operation and maintenance" on the Statements of Consolidated Income. Non-service cost components are presented within "Other, net."
The following table provides the key assumptions that were used to calculate the net periodic benefits cost for our various plans:
 Pension Benefits Other Postretirement
Benefits
  
202320222021202320222021
Weighted-average Assumptions to Determine Net Periodic Benefit Cost
Discount rate - service cost5.25 %3.08 %2.81 %5.30 %3.21 %3.00 %
Discount rate - interest cost5.06 %2.11 %1.57 %5.07 %2.24 %1.73 %
Expected Long-Term Rate of Return on Plan Assets7.00 %4.80 %5.20 %6.96 %5.72 %5.50 %
Rate of Compensation Increases4.00 %4.00 %4.00 %N/AN/AN/A
Interest Crediting Rates4.00 %4.00 %4.00 %N/AN/AN/A
We assumed a 7.00% and 6.96% rate of return on pension and other postretirement plan assets, respectively, for our calculation of 2023 pension benefits and other postretirement benefits costs. These rates were primarily based on asset mix and historical rates of return and were adjusted in 2023 due to changes in asset allocation and projected market returns.
The following table provides other changes in plan assets and projected benefit obligations recognized in other comprehensive income or regulatory asset or liability:
  
Pension BenefitsOther Postretirement
Benefits
(in millions)2023202220232022
Other Changes in Plan Assets and Projected Benefit Obligations 
Recognized in Other Comprehensive Income or Regulatory Asset 
or Liability
Net prior service cost $— $0.2 $3.3 $2.1 
Net actuarial (gain) loss
(20.9)158.9 16.0 (21.8)
Settlements/curtailments(9.2)(12.4)— — 
Less: amortization of prior service cost(0.1)(0.1)2.1 2.2 
Less: amortization of net actuarial loss(33.7)(20.3)(3.3)(2.6)
Total Recognized in Other Comprehensive Income or Regulatory 
Asset or Liability		$(63.9)$126.3 $18.1 $(20.1)
Amount Recognized in Net Periodic Benefits Cost and Other 
Comprehensive Income or Regulatory Asset or Liability		$(26.5)$136.6 $31.1 $(17.4)