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Note 13 - Pension and Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   

Pension Plan and SERP

   

Postretirement Plan

 
   

For the Three Months Ended September 30,

 
   

2022

   

2021

   

2022

   

2021

 

Interest cost

  $ 2.5     $ 2.7     $     $  

Expected return on plan assets

    (4.6 )     (8.2 )   $       (0.1 )

Amortization of prior service cost (credit)

              $        

Amortization of net actuarial loss

    0.9       1.0     $       0.1  

Net periodic (benefit) cost

  $ (1.2 )   $ (4.5 )   $     $  

Employer contributions, net

  $ 0.2     $ 0.2     $ 0.4     $ 1.3  
   

Pension Plan and SERP

   

Postretirement Plan

 
   

For the Nine Months Ended September 30,

 
   

2022

   

2021

   

2022

   

2021

 

Interest cost

  $ 8.8     $ 8.3     $ 0.2     $ 0.1  

Expected return on plan assets

    (20.4 )     (24.6 )     (0.2 )     (0.2 )

Amortization of prior service cost (credit)

    0.1       0.1             (0.1 )

Amortization of net actuarial loss

    2.1       2.9       0.2       0.2  

Net periodic (benefit) cost

  $ (9.4 )   $ (13.3 )   $ 0.2     $  

Employer contributions, net

  $ 0.6     $ 0.6     $ 1.1     $ 1.7