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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair value of plan assets $ 555.7 $ 531.3  
Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets 204.5 216.8  
Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets 351.2 314.5  
Managed Equity Accounts [Member]      
Fair value of plan assets [1] 195.0 206.3  
Managed Equity Accounts [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets [1] 195.0 206.3  
Managed Equity Accounts [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets [1] 0.0 0.0  
Equity - Pooled Separate Account [Member]      
Fair value of plan assets [2] 54.9 67.2  
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] 54.9 67.2  
Fixed Income Manager - Separately Managed Accounts [Member]      
Fair value of plan assets [3] 163.7    
Fixed Income Manager - Separately Managed Accounts [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets [3] 0.0    
Fixed Income Manager - Separately Managed Accounts [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets [3] 163.7    
Fixed Income Manager - Pooled Separate Accounts [Member]      
Fair value of plan assets [2] 97.9 208.3  
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] 97.9 208.3  
Fixed Income Manager - Government Securities [Member]      
Fair value of plan assets [4] 9.5 10.5  
Fixed Income Manager - Government Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets [4] 9.5 10.5  
Fixed Income Manager - Government Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets [4] 0.0 0.0  
Cash - Pooled Separate Account [Member]      
Fair value of plan assets [2] (0.1) 2.1  
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] (0.1) 2.1  
Global Real Estate [Member]      
Fair value of plan assets [5] 34.8 36.9  
Global Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]      
Fair value of plan assets [5] 0.0 0.0  
Global Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair value of plan assets [5] 34.8 36.9  
Pension Plan and SERP Plan [Member]      
Prior service benefit cost (credit) 2.8 3.0  
Actuarial losses 98.3 133.2  
Accumulated other comprehensive losses, pretax 101.1 136.2  
Fair value of plan assets 546.2 520.8 $ 488.9
Other Postretirement Benefits Plan [Member]      
Prior service benefit cost (credit) 0.0 (0.1)  
Actuarial losses 2.4 3.1  
Accumulated other comprehensive losses, pretax 2.4 3.0  
Fair value of plan assets $ 9.5 $ 10.5 $ 10.3
[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 separately managed accounts invest in U.S. Treasury Bonds and U.S. Treasury Separate Trading of Registered Interest and Principal of Securities (“UST STRIPS”). The fair values of these bonds and UST STRIPS are publicly quoted and are used in determining the NAV of the separately managed account, which is not publicly quoted.
[4] 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.
[5] 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.