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Retirement Plans, Postretirement and Postemployment Benefits (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Values of Pension Plan Assets by Asset Class and Fair Value Hierarchy Level | The fair values of pension plan assets by asset class and fair value hierarchy level are as follows:
| Fair Value Measurements |  |  |  |  |  |  |
December 31 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Net Asset Value |  |  | Total Fair Value |
(in millions) |  | 2023 |
Equity securities 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid-sized to large cap |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 307.2 |  |  | $ | 307.2 |
Small cap, international and emerging growth funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 319.5 |  |  |  | 319.5 |
Debt securities 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core fixed income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 319.2 |  |  |  | 319.2 |
Real estate |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 136.7 |  |  |  | 136.7 |
Private infrastructure |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 90.2 |  |  |  | 90.2 |
Cash equivalents |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4.0 |  |  |  | 4.0 |
Total |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,176.8 |  |  | $ | 1,176.8 |
|  | 2022 |
Equity securities 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mid-sized to large cap |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 291.6 |  |  | $ | 291.6 |
Small cap, international and emerging growth funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 287.2 |  |  |  | 287.2 |
Debt securities 1: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core fixed income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 249.1 |  |  |  | 249.1 |
Real estate |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 151.5 |  |  |  | 151.5 |
Private infrastructure |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 83.1 |  |  |  | 83.1 |
Cash equivalents |  |  | 0.2 |  |  |  | — |  |  |  | — |  |  |  | 4.4 |  |  |  | 4.6 |
Total |  | $ | 0.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,066.9 |  |  | $ | 1,067.1 |
1. These investments are common collective investment trusts valued using the net asset value (NAV) unit price provided by the fund administrator. The NAV is based on the value of the underlying assets owned by the fund.
Schedule of Assumed Health Care Cost Trend Rates | Assumed health care cost trend rates at December 31 are:
|  | 2023 |  | 2022
Health care cost trend rate assumed for next year |  | 6.50% |  | 6.75%
Rate to which the cost trend rate gradually declines |  | 4.75% |  | 4.75%
Year the rate reaches the ultimate rate |  | 2031 |  | 2031
Pension |
Schedule of Components of Net Periodic Benefit Cost (Credit) | The net periodic benefit cost of defined benefit plans includes the following components:
years ended December 31 (in millions) |  | 2023 |  |  | 2022 |  |  | 2021 |
Service cost |  | $ | 32.9 |  |  | $ | 48.1 |  |  | $ | 46.2 |
Interest cost |  |  | 51.3 |  |  |  | 41.2 |  |  |  | 35.7 |
Expected return on assets |  |  | (71.4 | ) |  |  | (77.3 | ) |  |  | (70.5 | )
Amortization of: |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 5.9 |  |  |  | 4.9 |  |  |  | 0.8 |
Actuarial loss |  |  | 0.6 |  |  |  | 3.9 |  |  |  | 12.2 |
Settlement charge |  |  | — |  |  |  | 4.6 |  |  |  | — |
Net periodic benefit cost |  | $ | 19.3 |  |  | $ | 25.4 |  |  | $ | 24.4 |
Schedule of Recognized Pretax Amounts in Comprehensive Earnings | The Company recognized the following pretax amounts in consolidated comprehensive earnings:
years ended December 31 |  |  |  |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |  |  | 2021 |
Actuarial loss (gain) |  | $ | 20.9 |  |  | $ | (114.5 | ) |  | $ | (67.5 | )
Prior service cost |  |  | — |  |  |  | 48.1 |  |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |
Prior service cost |  |  | (5.9 | ) |  |  | (4.9 | ) |  |  | (0.8 | )
Actuarial loss |  |  | (0.6 | ) |  |  | (3.9 | ) |  |  | (12.2 | )
Settlement charge |  |  | — |  |  |  | (4.6 | ) |  |  | — |
Total |  | $ | 14.4 |  |  | $ | (79.8 | ) |  | $ | (80.5 | )
Schedule of Net Periodic Benefit Credit or Cost Not Yet Recognized | Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit cost:
December 31 |  | 2023 |  |  | 2022 |
(in millions) |  | Gross |  |  | Net of tax |  |  | Gross |  |  | Net of tax |
Prior service cost |  | $ | 42.4 |  |  | $ | 20.0 |  |  | $ | 48.2 |  |  | $ | 20.3 |
Actuarial loss |  |  | 63.4 |  |  |  | 29.9 |  |  |  | 43.2 |  |  |  | 18.2 |
Total |  | $ | 105.8 |  |  | $ | 49.9 |  |  | $ | 91.4 |  |  | $ | 38.5 |
Schedule of Change in Projected Benefit Obligation | The defined benefit plans’ change in projected benefit obligation is as follows:
years ended December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Net projected benefit obligation at beginning of year |  | $ | 857.6 |  |  | $ | 1,135.5 |
Service cost |  |  | 32.9 |  |  |  | 48.1 |
Interest cost |  |  | 51.3 |  |  |  | 41.2 |
Actuarial loss (gain) |  |  | 72.6 |  |  |  | (363.3 | )
Gross benefits paid |  |  | (45.2 | ) |  |  | (52.0 | )
Plan amendments |  |  | — |  |  |  | 48.1 |
Net projected benefit obligation at end of year |  | $ | 969.2 |  |  | $ | 857.6 |
Schedule of Change In Plan Assets | The Company’s change in plan assets, funded status and amounts recognized on the Company’s consolidated balance sheets are as follows:
years ended December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Fair value of plan assets at beginning of year |  | $ | 1,067.1 |  |  | $ | 1,200.3 |
Actual return on plan assets, net |  |  | 123.1 |  |  |  | (171.4 | )
Employer contributions |  |  | 31.8 |  |  |  | 90.2 |
Gross benefits paid |  |  | (45.2 | ) |  |  | (52.0 | )
Fair value of plan assets at end of year |  | $ | 1,176.8 |  |  | $ | 1,067.1 |
Schedule of Funded Status |
December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Funded status of the plan at end of year |  | $ | 207.6 |  |  | $ | 209.5 |
Accrued benefit credit |  | $ | 207.6 |  |  | $ | 209.5 |
Schedule of Amounts Recognized on Consolidated Balance Sheets |
December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Amounts recognized on consolidated balance sheets consist of: |  |  |  |  |  |
Noncurrent asset |  | $ | 307.8 |  |  | $ | 295.3 |
Current liability |  |  | (7.5 | ) |  |  | (6.8 | )
Noncurrent liability |  |  | (92.7 | ) |  |  | (79.0 | )
Net amount recognized at end of year |  | $ | 207.6 |  |  | $ | 209.5 |
Schedule of Accumulated Benefit Obligations in Excess of Plan Assets | Benefit obligations and fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets are as follows:
December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Projected benefit obligation |  | $ | 100.7 |  |  | $ | 86.3 |
Accumulated benefit obligation |  | $ | 90.9 |  |  | $ | 79.5 |
Fair value of plan assets |  | $ | 0.5 |  |  | $ | 0.5 |
Schedule of Weighted-Average Assumptions | Weighted-average assumptions used to determine benefit obligations as of December 31 are:
|  | 2023 |  | 2022
Discount rate |  | 5.58% |  | 5.88%
Rate of increase in future compensation levels |  | 4.50% |  | 4.50%
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31 are:
|  | 2023 |  | 2022 |  | 2021
Discount rate |  | 5.88% |  | 3.44% |  | 3.16%
Rate of increase in future compensation levels |  | 4.50% |  | 4.50% |  | 4.50%
Expected long-term rate of return on assets |  | 6.75% |  | 6.75% |  | 6.75%
Schedule of Target Assets Allocation | The target allocation for 2023 and the actual pension plan asset allocation by asset class are as follows:
| Percentage of Plan Assets
|  | 2023 |  |
|  | Target |  | December 31
Asset Class |  | Allocation |  | 2023 |  | 2022
Equity securities |  | 56% |  | 53% |  | 54%
Debt securities |  | 28% |  | 27% |  | 24%
Real estate |  | 10% |  | 12% |  | 14%
Private infrastructure |  | 6% |  | 8% |  | 8%
Total |  | 100% |  | 100% |  | 100%
Schedule of Expected Benefit Payments | The expected benefit payments to be paid from plan assets for each of the next five years and the five-year period thereafter are as follows:
(in millions) |  |  |
2024 |  | $ | 50.0 |
2025 |  | $ | 66.3 |
2026 |  | $ | 58.8 |
2027 |  | $ | 62.3 |
2028 |  | $ | 64.7 |
Years 2029 - 2033 |  | $ | 341.3 |
Postretirement Benefits |
Schedule of Components of Net Periodic Benefit Cost (Credit) | The net periodic benefit credit for postretirement plans includes the following components:
years ended December 31 |  |  |  |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |  |  | 2021 |
Interest cost |  | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 0.3 |
Amortization of: |  |  |  |  |  |  |  |  |
Prior service credit |  |  | (0.3 | ) |  |  | (0.9 | ) |  |  | (0.8 | )
Actuarial gain |  |  | (0.6 | ) |  |  | (0.2 | ) |  |  | (0.1 | )
Total net periodic benefit credit |  | $ | (0.4 | ) |  | $ | (0.7 | ) |  | $ | (0.6 | )
Schedule of Recognized Pretax Amounts in Comprehensive Earnings | The Company recognized the following pretax amounts in consolidated comprehensive earnings:
years ended December 31 |  |  |  |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |  |  | 2021 |
Actuarial gain |  | $ | (0.1 | ) |  | $ | (2.0 | ) |  | $ | (0.6 | )
Amortization of: |  |  |  |  |  |  |  |  |
Prior service credit |  |  | 0.3 |  |  |  | 0.9 |  |  |  | 0.8 |
Actuarial gain |  |  | 0.6 |  |  |  | 0.2 |  |  |  | 0.1 |
Total |  | $ | 0.8 |  |  | $ | (0.9 | ) |  | $ | 0.3 |
Schedule of Net Periodic Benefit Credit or Cost Not Yet Recognized | Accumulated other comprehensive loss includes the following amounts that have not yet been recognized in net periodic benefit credit:
December 31 |  | 2023 |  |  | 2022 |
(in millions) |  | Gross |  |  | Net of tax |  |  | Gross |  |  | Net of tax |
Prior service credit |  | $ | (0.4 | ) |  | $ | (0.2 | ) |  | $ | (0.7 | ) |  | $ | (0.3 | )
Actuarial gain |  |  | (3.7 | ) |  |  | (1.7 | ) |  |  | (4.1 | ) |  |  | (1.7 | )
Total |  | $ | (4.1 | ) |  | $ | (1.9 | ) |  | $ | (4.8 | ) |  | $ | (2.0 | )
Schedule of Change in Projected Benefit Obligation | The postretirement health care plans’ change in benefit obligation is as follows:
years ended December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Net benefit obligation at beginning of year |  | $ | 8.9 |  |  | $ | 11.4 |
Interest cost |  |  | 0.5 |  |  |  | 0.4 |
Participants’ contributions |  |  | 0.7 |  |  |  | 0.6 |
Actuarial gain |  |  | (0.1 | ) |  |  | (1.9 | )
Gross benefits paid |  |  | (1.7 | ) |  |  | (1.6 | )
Net benefit obligation at end of year |  | $ | 8.3 |  |  | $ | 8.9 |
Schedule of Change In Plan Assets | The postretirement health care plans’ change in plan assets, funded status and amounts recognized on the Company’s consolidated balance sheets are as follows:
years ended December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Fair value of plan assets at beginning of year |  | $ | — |  |  | $ | — |
Employer contributions |  |  | 1.0 |  |  |  | 1.0 |
Participants’ contributions |  |  | 0.7 |  |  |  | 0.6 |
Gross benefits paid |  |  | (1.7 | ) |  |  | (1.6 | )
Fair value of plan assets at end of year |  | $ | — |  |  | $ | — |
Schedule of Funded Status |
December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Funded status of the plan at end of year |  | $ | (8.3 | ) |  | $ | (8.9 | )
Accrued benefit cost |  | $ | (8.3 | ) |  | $ | (8.9 | )
Schedule of Amounts Recognized on Consolidated Balance Sheets |
December 31 |  |  |  |  |  |
(in millions) |  | 2023 |  |  | 2022 |
Amounts recognized on consolidated balance sheets consist of: |  |  |  |  |  |
Current liability |  | $ | (1.0 | ) |  | $ | (1.0 | )
Noncurrent liability |  |  | (7.3 | ) |  |  | (7.9 | )
Net amount recognized at end of year |  | $ | (8.3 | ) |  | $ | (8.9 | )
Schedule of Weighted-Average Assumptions | Weighted-average assumptions used to determine the postretirement benefit obligation as of December 31 are:
|  | 2023 |  | 2022
Discount rate |  | 5.79% |  | 6.02%
Weighted-average assumptions used to determine net postretirement benefit credit for the years ended December 31 are:
|  | 2023 |  | 2022 |  | 2021
Discount rate |  | 6.02% |  | 3.02% |  | 2.48%
Schedule of Expected Benefit Payments | The total expected benefit payments to be paid by the Company, net of participant contributions, for each of the next five years and the five-year period thereafter are as follows:
(in millions) |  |  |
2024 |  | $ | 1.0 |
2025 |  | $ | 1.2 |
2026 |  | $ | 1.1 |
2027 |  | $ | 1.0 |
2028 |  | $ | 0.9 |
Years 2029 - 2033 |  | $ | 3.8 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (d)(5) -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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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (b) -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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