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Note 18 - Pension and Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2020
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 |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at January 1 |  | $ | 443.6 |  |  | $ | 407.8 |  |  | $ | 8.2 |  |  | $ | 9.7 |
Interest cost |  |  | 12.6 |  |  |  | 15.6 |  |  |  | 0.2 |  |  |  | 0.3 |
Actuarial loss (gain) |  |  | 32.1 |  |  |  | 48.2 |  |  |  | (0.2 | ) |  |  | (0.4 | )
Plan participants’ contributions |  |  | — |  |  |  | — |  |  |  | 1.6 |  |  |  | 2.1 |
Benefits paid |  |  | (28.4 | ) |  |  | (28.0 | ) |  |  | (2.3 | ) |  |  | (3.6 | )
Federal subsidy on benefits paid |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Benefit obligation at December 31 |  | $ | 459.9 |  |  | $ | 443.6 |  |  | $ | 7.5 |  |  | $ | 8.2 |
Accumulated benefit obligation at December 31 |  | $ | 459.9 |  |  | $ | 443.6 |  |  |  |  |  |  |  |  |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at January 1 |  | $ | 488.9 |  |  | $ | 421.3 |  |  | $ | 10.3 |  |  | $ | 9.7 |
Actual return on plan assets, net of expenses |  |  | 59.6 |  |  |  | 94.9 |  |  |  | 0.3 |  |  |  | 0.6 |
Employer contributions, net |  |  | 0.7 |  |  |  | 0.7 |  |  |  | 0.6 |  |  |  | 1.4 |
Plan participants’ contributions |  |  | — |  |  |  | — |  |  |  | 1.6 |  |  |  | 2.1 |
Benefits paid |  |  | (28.4 | ) |  |  | (28.0 | ) |  |  | (2.3 | ) |  |  | (3.6 | )
Federal subsidies received |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Fair value of plan assets at December 31 |  | $ | 520.8 |  |  | $ | 488.9 |  |  | $ | 10.5 |  |  | $ | 10.3 |
Funded status at December 31 |  | $ | (60.9 | ) |  | $ | (45.3 | ) |  | $ | (3.0 | ) |  | $ | (2.1 | )
Amounts recognized in the consolidated balance sheets consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension assets, noncurrent (1) |  | $ | (74.3 | ) |  | $ | (58.2 | ) |  | $ | (3.0 | ) |  | $ | (2.1 | )
Pension, SERP and postretirement benefits, current (2) |  |  | 1.0 |  |  |  | 0.8 |  |  |  | — |  |  |  | — |
Pension, SERP and postretirement benefits, noncurrent (3) |  |  | 12.4 |  |  |  | 12.1 |  |  |  | — |  |  |  | — |
Total Pension, SERP and Postretirement benefits |  | $ | (60.9 | ) |  | $ | (45.3 | ) |  | $ | (3.0 | ) |  | $ | (2.1 | )
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Prior service benefit cost (credit) |  | $ | 3.0 |  |  | $ | 3.2 |  |  | $ | (0.1 | ) |  | $ | (0.3 | )
Actuarial losses |  |  | 133.2 |  |  |  | 137.1 |  |  |  | 3.1 |  |  |  | 3.8 |
Accumulated other comprehensive losses, pretax |  | $ | 136.2 |  |  | $ | 140.3 |  |  | $ | 3.0 |  |  | $ | 3.5 |
|  |  |  |  |  | Quoted Prices |  |  | Significant |  |  |  |  |
|  |  |  |  |  | in Active |  |  | Other |  |  | Significant |
|  |  |  |  |  | Markets for |  |  | Observable |  |  | Unobservable |
|  |  |  |  |  | Identical Assets |  |  | Inputs |  |  | Inputs |
|  | Total |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Managed equity accounts (1) |  | $ | 206.3 |  |  | $ | 206.3 |  |  | $ | — |  |  | $ | — |
Equity — pooled separate account (2) |  |  | 67.2 |  |  |  | — |  |  |  | 67.2 |  |  |  | — |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income manager — pooled separate account (2) |  |  | 208.3 |  |  |  | — |  |  |  | 208.3 |  |  |  | — |
Fixed income manager — government securities (4) |  |  | 10.5 |  |  |  | 10.5 |  |  |  | — |  |  |  | — |
Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash — pooled separate account (2) |  |  | 2.1 |  |  |  | — |  |  |  | 2.1 |  |  |  | — |
Global real estate account (5) |  |  | 36.9 |  |  |  | — |  |  |  | 36.9 |  |  |  | — |
Total |  | $ | 531.3 |  |  | $ | 216.8 |  |  | $ | 314.5 |  |  | $ | — |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Managed equity accounts (1) |  | $ | 196.1 |  |  | $ | 196.1 |  |  | $ | — |  |  | $ | — |
Equity — pooled separate account (2) |  |  | 66.1 |  |  |  | — |  |  |  | 66.1 |  |  |  | — |
Equity — partnerships (3) |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | 0.1 |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income manager — pooled separate account (2) |  |  | 185.4 |  |  |  | — |  |  |  | 185.4 |  |  |  | — |
Fixed income manager — government securities (4) |  |  | 10.3 |  |  |  | 10.3 |  |  |  | — |  |  |  | — |
Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash — pooled separate account (2) |  |  | 3.4 |  |  |  | — |  |  |  | 3.4 |  |  |  | — |
Global real estate account (5) |  |  | 37.8 |  |  |  | — |  |  |  | 37.8 |  |  |  | — |
Total |  | $ | 499.2 |  |  | $ | 206.4 |  |  | $ | 292.7 |  |  | $ | 0.1 |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2020 |  |  | 2019 |  |  | 2018 |
Interest cost |  | $ | 12.6 |  |  | $ | 15.6 |  |  | $ | 15.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.3 |
Expected return on plan assets |  |  | (29.9 | ) |  |  | (30.3 | ) |  |  | (32.9 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | )
Amortization of prior service cost (credit) reclassified from accumulated other comprehensive losses |  |  | 0.2 |  |  |  | 0.2 |  |  |  | 0.2 |  |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | (0.1 | )
Amortization of net actuarial loss reclassified from accumulated other comprehensive losses |  |  | 6.3 |  |  |  | 4.5 |  |  |  | 3.2 |  |  |  | 0.3 |  |  |  | 0.3 |  |  |  | 0.4 |
Net periodic benefit (credit) cost |  |  | (10.8 | ) |  |  | (10.0 | ) |  |  | (14.3 | ) |  |  | 0.2 |  |  |  | 0.3 |  |  |  | 0.4 |
Amortization of prior service (cost) credit reclassified from accumulated other comprehensive losses |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.1 |
Amortization of actuarial loss reclassified from accumulated other comprehensive losses |  |  | (0.2 | ) |  |  | (0.1 | ) |  |  | (0.1 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net loss recognized reclassified from accumulated other comprehensive losses |  |  | (6.1 | ) |  |  | (4.4 | ) |  |  | (3.1 | ) |  |  | (0.3 | ) |  |  | (0.3 | ) |  |  | (0.4 | )
Actuarial (gain) loss |  |  | 2.4 |  |  |  | (16.4 | ) |  |  | 37.0 |  |  |  | (0.3 | ) |  |  | (0.8 | ) |  |  | (0.3 | )
Total recognized in other comprehensive (income) loss |  |  | (4.1 | ) |  |  | (21.1 | ) |  |  | 33.6 |  |  |  | (0.5 | ) |  |  | (1.0 | ) |  |  | (0.6 | )
Total recognized in net periodic benefit (credit) cost and other comprehensive (income) loss |  | $ | (14.9 | ) |  | $ | (31.1 | ) |  | $ | 19.3 |  |  | $ | (0.3 | ) |  | $ | (0.7 | ) |  | $ | (0.2 | )
Defined Benefit Plan, Assumptions [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
Weighted-average assumptions used to determine benefit obligations: |  | 2020 |  |  | 2019 |  |  |  |  |  |  | 2020 |  |  | 2019 |  |  |  |  |
Discount rate |  |  | 2.49 | % |  |  | 3.24 | % |  |  |  |  |  |  | 1.50 | % |  |  | 2.50 | % |  |  |  |
Expected return on plan assets |  |  | 6.50 | % |  |  | 6.75 | % |  |  |  |  |  |  | 2.00 | % |  |  | 2.00 | % |  |  |  |
Cash balance interest credit rate |  |  | 2.57 | % |  |  | 2.57 | % |  |  |  |  |  |  | Not applicable |  |  |  |  |
Weighted-average assumptions used to determine net periodic benefit (credit) loss: |  | 2020 |  |  | 2019 |  |  | 2018 |  |  | 2020 |  |  | 2019 |  |  | 2018 |
Discount rate |  |  | 2.83 | % |  |  | 3.82 | % |  |  | 3.50 | % |  |  | 2.50 | % |  |  | 3.75 | % |  |  | 3.00 | %
Expected return on plan assets |  |  | 6.75 | % |  |  | 7.00 | % |  |  | 7.00 | % |  |  | 2.00 | % |  |  | 2.00 | % |  |  | 2.00 | %
Cash balance interest credit rate |  |  | 2.57 | % |  |  | 2.57 | % |  |  | 2.57 | % |  |  | Not applicable |
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 |
2021 |  | $ | 30.5 |  |  | $ | 1.2 |  |  | $ | (0.2 | ) |  | $ | 1.0 |
2022 |  | $ | 30.1 |  |  | $ | 1.1 |  |  | $ | (0.2 | ) |  | $ | 0.9 |
2023 |  | $ | 30.3 |  |  | $ | 1.0 |  |  | $ | (0.2 | ) |  | $ | 0.8 |
2024 |  | $ | 29.9 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | 0.8 |
2025 |  | $ | 28.9 |  |  | $ | 0.7 |  |  | $ | — |  |  | $ | 0.7 |
2026-2030 |  | $ | 135.5 |  |  | $ | 2.4 |  |  | $ | (0.1 | ) |  | $ | 2.3 |
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Target |  |  | Percentage of Plan Assets |
Asset Category |  | Allocation |  |  | 2020 |  |  | 2019 |
Equity securities |  |  | 55.0 | % |  |  | 52.5 | % |  |  | 53.7 | %
Debt securities |  |  | 45.0 | % |  |  | 40.0 | % |  |  | 37.9 | %
Other |  |  | — | % |  |  | 7.5 | % |  |  | 8.4 | %
Total |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %

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