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Note 18 - Pension and Postretirement Benefits - Summary of Changes in Benefit Obligations and Plan Assets Amount Recognized (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair value of plan assets at January 1 |  | $ 499.2 |  |
Fair value of plan assets at December 31 |  | 531.3 | $ 499.2 |
Pension Plan and SERP Plan [Member] |  |  |  |
Benefit obligation |  | 443.6 | 407.8 |
Interest cost |  | 12.6 | 15.6 | $ 15.2
Actuarial loss (gain) |  | 32.1 | 48.2 |
Plan participants’ contributions |  | 0.0 | 0.0 |
Benefits paid |  | (28.4) | (28.0) |
Federal subsidy on benefits paid |  | 0.0 | 0.0 |
Benefit obligation |  | 459.9 | 443.6 | 407.8
Accumulated benefit obligation at December 31 |  | 459.9 | 443.6 |
Fair value of plan assets at January 1 |  | 488.9 | 421.3 |
Actual return on plan assets, net of expenses |  | 59.6 | 94.9 |
Employer contributions, net |  | 0.7 | 0.7 |
Plan participants’ contributions |  | 0.0 | 0.0 |
Benefits paid |  | (28.4) | (28.0) |
Federal subsidies received |  | 0.0 | 0.0 |
Fair value of plan assets at December 31 |  | 520.8 | 488.9 | 421.3
Funded status at December 31 |  | (60.9) | (45.3) |
Pension assets, noncurrent (1) | [1] | (74.3) | (58.2) |
Pension, SERP and postretirement benefits, current (2) | [2] | 1.0 | 0.8 |
Pension, SERP and postretirement benefits, noncurrent (3) | [3] | 12.4 | 12.1 |
Total Pension, SERP and Postretirement benefits |  | (60.9) | (45.3) |
Other Postretirement Benefits Plan [Member] |  |  |  |
Benefit obligation |  | 8.2 | 9.7 |
Interest cost |  | 0.2 | 0.3 | 0.3
Actuarial loss (gain) |  | (0.2) | (0.4) |
Plan participants’ contributions |  | 1.6 | 2.1 |
Benefits paid |  | (2.3) | (3.6) |
Federal subsidy on benefits paid |  | 0.0 | 0.1 |
Benefit obligation |  | 7.5 | 8.2 | 9.7
Accumulated benefit obligation at December 31 |  |  |  |
Fair value of plan assets at January 1 |  | 10.3 | 9.7 |
Actual return on plan assets, net of expenses |  | 0.3 | 0.6 |
Employer contributions, net |  | 0.6 | 1.4 |
Plan participants’ contributions |  | 1.6 | 2.1 |
Benefits paid |  | (2.3) | (3.6) |
Federal subsidies received |  | 0.0 | 0.1 |
Fair value of plan assets at December 31 |  | 10.5 | 10.3 | $ 9.7
Funded status at December 31 |  | (3.0) | (2.1) |
Pension assets, noncurrent (1) | [1] | (3.0) | (2.1) |
Pension, SERP and postretirement benefits, current (2) | [2] | 0.0 | 0.0 |
Pension, SERP and postretirement benefits, noncurrent (3) | [3] | 0.0 | 0.0 |
Total Pension, SERP and Postretirement benefits |  | $ (3.0) | $ (2.1) |
[1] | Included in "Other assets" in our accompanying consolidated balance sheets
[2] | Included in "Accounts payable and accrued liabilities" in our accompanying consolidated balance sheets
[3] | Included in "Other liabilities" in our accompanying consolidated balance sheets

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 + Details
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