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Note 18 - Pension and Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at January 1 |  | $ | 330.9 |  |  | $ | 431.7 |  |  | $ | 4.2 |  |  | $ | 6.0 |
Interest cost |  |  | 17.1 |  |  |  | 14.7 |  |  |  | 0.2 |  |  |  | 0.1 |
Actuarial (gain) loss |  |  | (0.8 | ) |  |  | (86.6 | ) |  |  | 1.1 |  |  |  | (0.4 | )
Plan participants’ contributions |  |  | — |  |  |  | — |  |  |  | 1.3 |  |  |  | 1.3 |
Benefits paid |  |  | (29.4 | ) |  |  | (28.9 | ) |  |  | (2.7 | ) |  |  | (2.8 | )
Benefit obligation at December 31 |  | $ | 317.8 |  |  | $ | 330.9 |  |  | $ | 4.1 |  |  | $ | 4.2 |
Accumulated benefit obligation at December 31 |  | $ | 317.8 |  |  | $ | 330.9 |  |  |  |  |  |  |  |  |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at January 1 |  | $ | 406.3 |  |  | $ | 546.2 |  |  | $ | 7.6 |  |  | $ | 9.5 |
Actuarial gain (loss) |  |  | 47.3 |  |  |  | (111.8 | ) |  |  | 0.4 |  |  |  | (1.1 | )
Employer contributions, net |  |  | 1.7 |  |  |  | 0.8 |  |  |  | 1.5 |  |  |  | 0.7 |
Plan participants’ contributions |  |  | — |  |  |  | — |  |  |  | 1.3 |  |  |  | 1.3 |
Benefits paid |  |  | (29.4 | ) |  |  | (28.9 | ) |  |  | (2.7 | ) |  |  | (2.8 | )
Fair value of plan assets at December 31 |  | $ | 425.9 |  |  | $ | 406.3 |  |  | $ | 8.1 |  |  | $ | 7.6 |
Funded status at December 31 |  | $ | (108.1 | ) |  | $ | (75.4 | ) |  | $ | (4.0 | ) |  | $ | (3.4 | )
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension assets, noncurrent (1) |  | $ | (117.4 | ) |  | $ | (85.6 | ) |  | $ | (4.0 | ) |  | $ | (3.4 | )
Pension, SERP and postretirement benefits, current (2) |  |  | 1.0 |  |  |  | 0.8 |  |  |  | — |  |  |  | — |
Pension, SERP and postretirement benefits, noncurrent (3) |  |  | 8.3 |  |  |  | 9.4 |  |  |  | — |  |  |  | — |
Total Pension, SERP and Postretirement benefits |  | $ | (108.1 | ) |  | $ | (75.4 | ) |  | $ | (4.0 | ) |  | $ | (3.4 | )
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Prior service benefit cost |  | $ | 2.4 |  |  | $ | 2.6 |  |  | $ | — |  |  | $ | — |
Actuarial losses |  |  | 118.3 |  |  |  | 147.8 |  |  |  | 3.6 |  |  |  | 3.2 |
Accumulated other comprehensive losses, pretax |  | $ | 120.7 |  |  | $ | 150.4 |  |  | $ | 3.6 |  |  | $ | 3.2 |
|  |  |  |  |  | Quoted Prices |  |  | Significant |
|  |  |  |  |  | in Active |  |  | Other |
|  |  |  |  |  | Markets for |  |  | Observable |
|  |  |  |  |  | Identical Assets |  |  | Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Managed equity accounts (1) |  | $ | 131.6 |  |  | $ | 131.6 |  |  | $ | — |
Equity — pooled separate account (2) |  |  | 38.6 |  |  |  | — |  |  |  | 38.6 |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Fixed income manager — separately managed account (5) |  |  | 138.9 |  |  |  | — |  |  |  | 138.9 |
Fixed income manager — pooled separate account (2) |  |  | 89.2 |  |  |  | — |  |  |  | 89.2 |
Fixed income manager — government securities (3) |  |  | 8.1 |  |  |  | 8.1 |  |  |  | — |
Others |  |  |  |  |  |  |  |  |  |  |  |
Cash — pooled separate account (2) |  |  | 5.2 |  |  |  | — |  |  |  | 5.2 |
Global real estate account (4) |  |  | 22.4 |  |  |  | — |  |  |  | 22.4 |
Total |  | $ | 434.0 |  |  | $ | 139.7 |  |  | $ | 294.3 |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |
Managed equity accounts (1) |  | $ | 128.8 |  |  | $ | 128.8 |  |  | $ | — |
Equity — pooled separate account (2) |  |  | 39.7 |  |  |  | — |  |  |  | 39.7 |
Debt |  |  |  |  |  |  |  |  |  |  |  |
Fixed income manager — separately managed account (5) |  |  | 133.6 |  |  |  | — |  |  |  | 133.6 |
Fixed income manager — pooled separate account (2) |  |  | 81.5 |  |  |  | — |  |  |  | 81.5 |
Fixed income manager — government securities (3) |  |  | 7.7 |  |  |  | 7.7 |  |  |  | — |
Others |  |  |  |  |  |  |  |  |  |  |  |
Cash — pooled separate account (2) |  |  | 2.7 |  |  |  | — |  |  |  | 2.7 |
Global real estate account (4) |  |  | 20.2 |  |  |  | — |  |  |  | 20.2 |
Total |  | $ | 414.2 |  |  | $ | 136.5 |  |  | $ | 277.7 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Interest cost |  | $ | 17.1 |  |  | $ | 14.7 |  |  | $ | 11.0 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Expected return on plan assets |  |  | (24.1 | ) |  |  | (28.2 | ) |  |  | (32.8 | ) |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | (0.2 | )
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive income |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.2 |  |  |  | — |  |  |  | — |  |  |  | (0.1 | )
Amortization of net actuarial loss reclassified from accumulated other comprehensive income |  |  | 5.2 |  |  |  | 4.0 |  |  |  | 3.8 |  |  |  | 0.4 |  |  |  | 0.2 |  |  |  | 0.2 |
Net periodic (credit) benefit cost |  |  | (1.6 | ) |  |  | (9.3 | ) |  |  | (17.8 | ) |  |  | 0.5 |  |  |  | 0.1 |  |  |  | — |
Less: Amortization of prior service (cost) credit reclassified from accumulated other comprehensive income |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | — |  |  |  | — |  |  |  | 0.1 |
Less: Amortization of actuarial loss reclassified from accumulated other comprehensive losses |  |  | (0.1 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | — |  |  |  | — |  |  |  | — |
Less: Net loss recognized reclassified from accumulated other comprehensive losses |  |  | (5.1 | ) |  |  | (3.8 | ) |  |  | (3.6 | ) |  |  | (0.4 | ) |  |  | (0.2 | ) |  |  | (0.2 | )
Actuarial (gain) loss |  |  | (24.3 | ) |  |  | 53.5 |  |  |  | (31.1 | ) |  |  | 0.8 |  |  |  | 1.0 |  |  |  | (0.5 | )
Total recognized in other comprehensive income |  |  | (29.7 | ) |  |  | 49.3 |  |  |  | (35.1 | ) |  |  | 0.4 |  |  |  | 0.8 |  |  |  | (0.6 | )
Total recognized in net periodic benefit credit and other comprehensive (income) loss |  | $ | (31.3 | ) |  | $ | 40.0 |  |  | $ | (52.9 | ) |  | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | (0.6 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
Weighted-average assumptions used to determine benefit obligations: |  | 2023 |  |  | 2022 |  |  |  |  |  |  | 2023 |  |  | 2022 |  |  |  |  |
Discount rate |  | 5.37 | % |  | 5.49 | % |  |  |  |  |  | 4.75 | % |  | 5.25 | % |  |  |  |
Expected return on plan assets |  | 6.50 | % |  | 6.25 | % |  |  |  |  |  | 1.75 | % |  | 1.75 | % |  |  |  |
Cash balance interest credit rate |  | 4.43 | % |  | 2.57 | % |  |  |  |  | N/A |  |  |  |  |  |  |
Weighted-average assumptions used to determine net periodic benefit (credit) cost: |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2023 |  |  | 2022 |  |  | 2021 |
Discount rate |  | 5.48 | % |  | 2.75 | % |  | 2.49 | % |  | 5.25 | % |  | 2.25 | % |  | 1.50 | %
Expected return on plan assets |  | 6.25 | % |  | 6.25 | % |  | 6.50 | % |  | 1.75 | % |  | 1.75 | % |  | 2.00 | %
Cash balance interest credit rate |  | 4.43 | % |  | 2.57 | % |  | 2.57 | % |  | N/A |  |  |  |  |  |  |
Schedule of Expected Benefit Payments [Table Text Block] |
|  | Pension Plan |  |  | Postretirement |
|  | and SERP |  |  | Plan |
|  | Gross |  |  | Gross |  |  | Medicare |  |  | Net |
|  | Benefit |  |  | Benefit |  |  | Subsidy |  |  | Benefit |
|  | Amount |  |  | Amount |  |  | Payments |  |  | Amount |
2024 |  | $ | 29.4 |  |  | $ | 0.8 |  |  | $ | (0.1 | ) |  | $ | 0.7 |
2025 |  | $ | 28.9 |  |  | $ | 0.7 |  |  | $ | — |  |  | $ | 0.7 |
2026 |  | $ | 28.4 |  |  | $ | 0.6 |  |  | $ | — |  |  | $ | 0.6 |
2027 |  | $ | 28.4 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 0.5 |
2028 |  | $ | 27.0 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | 0.4 |
2029 and thereafter |  | $ | 123.3 |  |  | $ | 1.4 |  |  | $ | — |  |  | $ | 1.4 |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Target |  |  | Percentage of Plan Assets |
Asset Category |  | Allocation |  |  | 2023 |  |  | 2022 |
Equity securities |  |  | 40.0 | % |  |  | 40.0 | % |  |  | 41.4 | %
Debt securities |  |  | 60.0 |  |  |  | 53.5 |  |  |  | 52.9 |
Real Estate |  |  | — |  |  |  | 5.3 |  |  |  | 5.0 |
Other |  |  | — |  |  |  | 1.2 |  |  |  | 0.7 |
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %

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