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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2023
Retirement Benefits [Abstract] |
Obligation and Funded Status |
Pension Obligation and Funded Status
As of December 31 | 2023 | 2022
Millions |  |
Accumulated Benefit Obligation | $729.5 |  | $724.5 |
Change in Benefit Obligation |  |
Obligation, Beginning of Year | $739.7 |  | $911.7 |
Service Cost | 6.5 |  | 9.3 |
Interest Cost | 40.5 |  | 27.2 |
Plan Amendments | — |  | 0.8 |
Actuarial (Gain) Loss (a) | 13.9 |  | (160.6) |
Benefits Paid | (60.9) |  | (58.9) |
Participant Contributions | 6.6 |  | 10.2 |
Obligation, End of Year | $746.3 |  | $739.7 |
Change in Plan Assets |  |
Fair Value, Beginning of Year | $568.6 |  | $745.7 |
Actual Return on Plan Assets | 55.1 |  | (130.5) |
Employer Contribution (b) | 26.2 |  | 12.3 |
Benefits Paid | (60.9) |  | (58.9) |
Fair Value, End of Year | $589.0 |  | $568.6 |
Funded Status, End of Year | $(157.3) | $(171.1)
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of: |  |
Current Liabilities | $(2.1) | $(2.1)
Non-Current Liabilities | $(155.2) | $(169.0)
(a) Actuarial gain in 2022 was primarily the result of increases in discount rates. (b) Includes Participant Contributions noted above, any contributions made by the Company to pension plan trusts and any direct benefit payments made under certain plans.
Postretirement Health and Life Obligation and Funded Status
As of December 31 | 2023 | 2022
Millions |  |
Change in Benefit Obligation |  |
Obligation, Beginning of Year | $110.4 |  | $148.2 |
Service Cost | 2.0 |  | 3.0 |
Interest Cost | 5.6 |  | 4.4 |
Actuarial Gain (a) | (9.3) |  | (38.7) |
Benefits Paid | (8.1) |  | (9.2) |
Participant Contributions | 2.4 |  | 2.7 |
Plan Amendments (b) | (29.1) |  | — |
Obligation, End of Year | $73.9 |  | $110.4 |
Change in Plan Assets |  |
Fair Value, Beginning of Year | $162.6 |  | $201.8 |
Actual Return on Plan Assets | 20.3 |  | (33.0) |
Employer Contribution (Withdrawal) | (3.4) |  | 0.3 |
Participant Contributions | 2.4 |  | 2.7 |
Benefits Paid | (8.1) |  | (9.2) |
Fair Value, End of Year | $173.8 |  | $162.6 |
Funded Status, End of Year | $99.9 |  | $52.2 |
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of: |  |
Non-Current Assets | $106.3 | $58.8
Current Liabilities | $(0.2) | $(0.2)
Non-Current Liabilities | $(6.2) | $(6.4)
(a)Actuarial gain in 2022 was primarily the result of increases in discount rates. (b)In 2023, the postretirement health care plan was amended to change the company contribution to an annual stipend for certain retirees.
Amounts Recognized in Consolidated Balance Sheet |
Reconciliation of Net Pension Amounts Recognized in Consolidated Balance Sheet
As of December 31 | 2023 | 2022
Millions |  |
Net Loss | $(256.9) | $(260.2)
Prior Service Credit | — | 0.1
Accumulated Contributions in Excess of Net Periodic Benefit Cost (Prepaid Pension Asset) | 99.6 | 89.0
Total Net Pension Amounts Recognized in Consolidated Balance Sheet | $(157.3) | $(171.1)
Reconciliation of Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet
As of December 31 | 2023 | 2022
Millions |  |
Net Gain (a) | $24.8 | $9.2
Prior Service Credit | 33.8 | 13.2
Accumulated Net Periodic Benefit Cost in Excess of Contributions (a) | 41.3 | 29.8
Total Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet | $99.9 | $52.2
(a)Excludes gains, losses and contributions associated with irrevocable grantor trusts.
Components of Net Periodic Cost |
Components of Net Periodic Pension Cost
Year Ended December 31 | 2023 | 2022 | 2021
Millions |  |  |
Service Cost | $6.5 |  | $9.3 |  | $11.0 |
Non-Service Cost Components (a) |  |  |
Interest Cost | 40.5 |  | 27.2 |  | 24.6 |
Expected Return on Plan Assets | (43.8) |  | (41.5) |  | (43.4) |
Amortization of Loss | 5.8 |  | 11.4 |  | 18.8 |
Amortization of Prior Service Credit | (0.1) |  | (0.1) |  | (0.2) |
Net Pension Cost | $8.9 |  | $6.3 |  | $10.8 |
(a)These components of net periodic pension cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
Components of Net Periodic Postretirement Health and Life Cost
Year Ended December 31 | 2023 | 2022 | 2021
Millions |  |  |
Service Cost | $2.0 |  | $3.0 |  | $3.6 |
Non-Service Cost Components (a) |  |  |
Interest Cost | 5.6 |  | 4.4 |  | 4.4 |
Expected Return on Plan Assets | (11.4) |  | (9.6) |  | (9.9) |
Amortization of (Gain) Loss | (2.7) |  | 0.4 |  | 3.0 |
Amortization of Prior Service Credit | (8.5) |  | (7.5) |  | (7.6) |
Net Postretirement Health and Life Credit | $(15.0) | $(9.3) | $(6.5)
(a)These components of net periodic postretirement health and life cost are included in the line item “Other” under Other Income (Expense) on the Consolidated Statement of Income.
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities |
Other Changes in Pension Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 31 | 2023 | 2022
Millions |  |
Net Loss | $2.5 | $11.4
Amortization of Prior Service Credit | 0.1 |  | 0.1 |
Prior Service Credit Arising During the Period | — |  | 0.8 |
Amortization of Loss | (5.7) | (11.4) |
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $(3.1) | $0.9
Other Changes in Postretirement Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 31 | 2023 | 2022
Millions |  |
Net (Gain) Loss | $(18.3) | $3.9
Prior Service Credit Arising During the Period | (29.1) |  | — |
Amortization of Prior Service Credit | 8.4 |  | 7.5 |
Amortization of Gain (Loss) | 2.7 |  | (0.4) |
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $(36.3) | $11.0
Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets |
Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets
As of December 31 | 2023 | 2022
Millions |  |
Projected Benefit Obligation | $746.3 |  | $739.7 |
Accumulated Benefit Obligation | $729.5 |  | $724.5 |
Fair Value of Plan Assets | $589.0 |  | $568.6 |
Unrecognized Postretirement Health and Life Costs | The postretirement health and life costs that are reported as a component within the Consolidated Balance Sheet, reflected in regulatory long-term assets or liabilities and accumulated other comprehensive income, consist of the following:
Unrecognized Postretirement Health and Life Costs
As of December 31 | 2023 | 2022
Millions |  |
Net Gain | $(24.8) | $(9.2)
Prior Service Credit | (33.8) | (13.2)
Total Unrecognized Postretirement Health and Life Cost | $(58.6) | $(22.4)
Estimated Future Benefit Payments |
Estimated Future Benefit Payments | Pension | Postretirement Health and Life
Millions |  |
2024 | $58.4 | $6.3 |
2025 | $58.1 | $6.2 |
2026 | $57.5 | $6.1 |
2027 | $57.2 | $6.1 |
2028 | $56.9 | $6.0 |
Years 2029 – 2033 | $272.6 | $30.0 |
Weighted Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs |
Weighted Average Assumptions Used to Determine Benefit Obligation
As of December 31 | 2023 | 2022
Discount Rate |  |
Pension | 5.39% | 5.70%
Postretirement Health and Life | 5.42% | 5.68%
Rate of Compensation Increase | 3.52% | 3.58%
Health Care Trend Rates |  |
Trend Rate | 7.00% | 6.50%
Ultimate Trend Rate | 5.00% | 5.00%
Year Ultimate Trend Rate Effective | 2038 | 2038
Weighted Average Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31 | 2023 | 2022 | 2021
Discount Rate |  |  |
Pension | 5.70% | 3.28% | 2.87%
Postretirement Health and Life | 5.89% | 3.09% | 2.70%
Expected Long-Term Return on Plan Assets |  |  |
Pension | 6.83% | 6.00% | 6.50%
Postretirement Health and Life | 6.33% | 5.41% | 5.85%
Rate of Compensation Increase | 3.58% | 3.58% | 3.62%
Plan Asset Actual and Target Allocations |
Actual Plan Asset Allocations | Pension | Postretirement Health and Life (a)
| 2023 | 2022 | 2023 | 2022
Equity Securities | 57% | 46% | 67% | 66%
Fixed Income Securities | 40% | 50% | 33% | 34%
Real Estate | 3% | 4% | — | —
| 100% | 100% | 100% | 100%
(a)Includes VEBAs and irrevocable grantor trusts. Following are the current targeted allocations as of December 31, 2023:
Plan Asset Target Allocations | Pension | Postretirement Health and Life (a)
Equity Securities | 55 | % | 65 | %
Fixed Income Securities | 41 | % | 35 | %
Real Estate | 4 | % | — |
| 100 | % | 100 | %
(a)Includes VEBAs and irrevocable grantor trusts.
Recurring Fair Value Measures |
| Fair Value as of December 31, 2023
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) | — | $83.7 | — | $83.7
U.S. Mid-cap Growth (a) | — | 69.9 | — | 69.9
U.S. Small-cap (a) | — | 46.5 | — | 46.5
International | $134.6 | — | — | 134.6
Fixed Income Securities (a) | — | 215.0 | — | 215.0
Cash and Cash Equivalents | 20.4 | — | — | 20.4
Real Estate | — | — | $18.9 | 18.9
Total Fair Value of Assets | $155.0 | $415.1 | $18.9 | $589.0
(a)The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity and fixed income securities indexes.
| Fair Value as of December 31, 2022
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) | — |  | $61.2 |  | — |  | $61.2 |
U.S. Mid-cap Growth (a) | — |  | 40.0 |  | — |  | 40.0 |
U.S. Small-cap (a) | — |  | 35.4 |  | — |  | 35.4 |
International | $127.0 |  | — |  | — |  | 127.0 |
Fixed Income Securities (a) | — |  | 275.3 |  | — |  | 275.3 |
Cash and Cash Equivalents | 7.3 |  | — |  | — |  | 7.3 |
Real Estate | — |  | — |  | $22.4 |  | 22.4 |
Total Fair Value of Assets | $134.3 |  | $411.9 |  | $22.4 |  | $568.6 |
(a)The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity and fixed income securities indexes.
| Fair Value as of December 31, 2023
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: (a) |  |  |  |
U.S. Large-cap | $30.0 |  | — |  | — |  | $30.0 |
U.S. Mid-cap Growth | 28.7 |  | — |  | — |  | 28.7 |
U.S. Small-cap | 14.9 |  | — |  | — |  | 14.9 |
International | 41.9 |  | — |  | — |  | 41.9 |
Fixed Income Securities: |  |  |  |
Mutual Funds | 55.1 |  | — |  | — |  | 55.1 |
Cash and Cash Equivalents | 3.2 |  | — |  | — |  | 3.2 |
Total Fair Value of Assets | $173.8 |  | — |  | — |  | $173.8 |
(a)The underlying investments consist of mutual funds (Level 1).
| Fair Value as of December 31, 2022
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: (a) |  |  |  |
U.S. Large-cap | $26.7 |  | — |  | — |  | $26.7 |
U.S. Mid-cap Growth | 25.5 |  | — |  | — |  | 25.5 |
U.S. Small-cap | 12.7 |  | — |  | — |  | 12.7 |
International | 41.5 |  | — |  | — |  | 41.5 |
Fixed Income Securities: |  |  |  |
Mutual Funds | 55.5 |  | — |  | — |  | 55.5 |
Cash and Cash Equivalents | 0.7 |  | — |  | — |  | 0.7 |
Total Fair Value of Assets | $162.6 |  | — |  | — |  | $162.6 |
(a)The underlying investments consist of mutual funds (Level 1). NOTE 12. PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Continued) Fair Value (Continued)
Recurring Fair Value Measures - Activity in Level 3 |
Recurring Fair Value Measures |  |
Activity in Level 3 |  | Real Estate
Millions |  |
Balance as of December 31, 2022 |  | $22.4 |
Actual Return on Plan Assets |  | (3.1) |
Purchases, Sales, and Settlements – Net |  | (0.4) |
Balance as of December 31, 2023 |  | $18.9
Recurring Fair Value Measures |  |  |
Activity in Level 3 |  |  | Real Estate
Millions |  |  |
Balance as of December 31, 2021 |  |  | $21.6 |
Actual Return on Plan Assets |  |  | 1.0 |
Purchases, Sales, and Settlements – Net |  |  | (0.2) |
Balance as of December 31, 2022 |  |  | $22.4 |
Recurring Fair Value Measures |
Activity in Level 3 | Private Equity Funds
Millions |
Balance as of December 31, 2021 | $2.0 |
Actual Return on Plan Assets | (1.5) |
Purchases, Sales, and Settlements – Net | (0.5) |
Balance as of December 31, 2022 | — |

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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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