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Note 18 - Pension and Postretirement Benefits - Summary of Pre-tax Components of Accumulated Other Comprehensive Losses (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair value of plan assets |  | $ 531.3 | $ 499.2 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets |  | 216.8 | 206.4 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets |  | 314.5 | 292.7 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets |  | 0.0 | 0.1 |
Managed Equity Accounts [Member] |  |  |  |
Fair value of plan assets | [1] | 206.3 | 196.1 |
Managed Equity Accounts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [1] | 206.3 | 196.1 |
Managed Equity Accounts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [1] | 0.0 | 0.0 |
Managed Equity Accounts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [1] | 0.0 | 0.0 |
Equity - Pooled Separate Account [Member] |  |  |  |
Fair value of plan assets | [2] | 67.2 | 66.1 |
Equity - Pooled Separate Account [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
Equity - Pooled Separate Account [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [2] | 67.2 | 66.1 |
Equity - Pooled Separate Account [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
Fixed Income Manager - Pooled Separate Accounts [Member] |  |  |  |
Fair value of plan assets | [2] | 208.3 | 185.4 |
Fixed Income Manager - Pooled Separate Accounts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
Fixed Income Manager - Pooled Separate Accounts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [2] | 208.3 | 185.4 |
Fixed Income Manager - Pooled Separate Accounts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
Fixed Income Manager - Government Securities [Member] |  |  |  |
Fair value of plan assets | [3] | 10.5 | 10.3 |
Fixed Income Manager - Government Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [3] | 10.5 | 10.3 |
Fixed Income Manager - Government Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [3] | 0.0 | 0.0 |
Fixed Income Manager - Government Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [3] | 0.0 | 0.0 |
Cash - Pooled Separate Account [Member] |  |  |  |
Fair value of plan assets | [2] | 2.1 | 3.4 |
Cash - Pooled Separate Account [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
Cash - Pooled Separate Account [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [2] | 2.1 | 3.4 |
Cash - Pooled Separate Account [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [2] | 0.0 | 0.0 |
Global Real Estate [Member] |  |  |  |
Fair value of plan assets | [4] | 36.9 | 37.8 |
Global Real Estate [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
Global Real Estate [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [4] | 36.9 | 37.8 |
Global Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [4] | 0.0 | 0.0 |
Equity - Partnerships [Member] |  |  |  |
Fair value of plan assets | [5] | 0.1 |  |
Equity - Partnerships [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair value of plan assets | [5] | 0.0 |  |
Equity - Partnerships [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair value of plan assets | [5] | 0.0 |  |
Equity - Partnerships [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair value of plan assets | [5] | 0.1 |  |
Pension Plan and SERP Plan [Member] |  |  |  |
Prior service benefit cost (credit) |  | 3.0 | 3.2 |
Actuarial losses |  | 133.2 | 137.1 |
Accumulated other comprehensive losses, pretax |  | 136.2 | 140.3 |
Fair value of plan assets |  | 520.8 | 488.9 | $ 421.3
Other Postretirement Benefits Plan [Member] |  |  |  |
Prior service benefit cost (credit) |  | (0.1) | (0.3) |
Actuarial losses |  | 3.1 | 3.8 |
Accumulated other comprehensive losses, pretax |  | 3.0 | 3.5 |
Fair value of plan assets |  | $ 10.5 | $ 10.3 | $ 9.7
[1] | Valued at the closing price of shares for domestic stocks within the managed equity accounts, and valued at the net asset value ("NAV") of shares for mutual funds at either the closing price reported in the active market or based on yields currently available on comparable securities of issuers with similar credit ratings for corporate bonds held by the Pension Plan in these managed accounts.
[2] | The pooled separate accounts invest in domestic and foreign stocks, bonds and mutual funds. The fair values of these stocks, bonds and mutual funds are publicly quoted and are used in determining the NAV of the pooled separate account, which is not publicly quoted.
[3] | The fund invested in the U.S. government, its agencies or instrumentalities or securities that are rated AAA by S&P, AAA by Fitch, or Aaa by Moody’s, including but not limited to mortgage securities such as agency and non-agency collateralized mortgage obligations, and other obligations that are secured by mortgages or mortgage backed securities, and valued at the closing price reported in the active market.
[4] | The funds invested in common stocks and other equity securities issued by domestic and foreign real estate companies, including real estate investment trusts ("REIT") and similar REIT-like entities. The fair values of these stocks, bonds and mutual funds are publicly quoted and are used in determining the NAV of the funds, which is not publicly quoted.
[5] | Investments for which readily determinable prices do not exist are valued by the General Partner using either the market or income approach. In establishing the estimated fair value of investments, including those without readily determinable values, the General Partner assumes a reasonable period of time for liquidation of the investment, and takes into consideration the financial condition and operating results of the underlying portfolio company, nature of investment, restrictions on marketability, holding period, market conditions, foreign currency exposures, and other factors the General Partner deems appropriate.

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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