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Note 13 - Pension and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2023
Notes Tables |
Schedule of Net Benefit Costs [Table Text Block] |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | For the Three Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Interest cost |  | $ | 4.4 |  |  | $ | 2.5 |  |  | $ | — |  |  | $ | — |
Expected return on plan assets |  |  | (6.0 | ) |  |  | (4.6 | ) |  |  | — |  |  |  | — |
Amortization of prior service cost |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of net actuarial loss |  |  | 1.2 |  |  |  | 0.9 |  |  |  | — |  |  |  | — |
Net periodic (benefit) cost |  | $ | (0.3 | ) |  | $ | (1.2 | ) |  | $ | — |  |  | $ | — |
Employer contributions, net |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.4 |
|  | Pension Plan and SERP |  |  | Postretirement Plan |
|  | For the Nine Months Ended September 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Interest cost |  | $ | 13.1 |  |  | $ | 8.8 |  |  | $ | — |  |  | $ | 0.2 |
Expected return on plan assets |  |  | (18.2 | ) |  |  | (20.4 | ) |  |  | — |  |  |  | (0.2 | )
Amortization of prior service cost |  |  | 0.2 |  |  |  | 0.1 |  |  |  | — |  |  |  | — |
Amortization of net actuarial loss |  |  | 3.9 |  |  |  | 2.1 |  |  |  | — |  |  |  | 0.2 |
Net periodic (benefit) cost |  | $ | (1.0 | ) |  | $ | (9.4 | ) |  | $ | — |  |  | $ | 0.2 |
Employer contributions, net |  | $ | 1.5 |  |  | $ | 0.6 |  |  | $ | 1.0 |  |  | $ | 1.1 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration