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Note 13 - Pension and Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2021
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   

Pension Plan and SERP

   

Postretirement Plan

 
   

For the Three Months Ended September 30,

 
   

2021

   

2020

   

2021

   

2020

 

Interest cost

  $ 2.7     $ 2.9     $     $  

Expected return on plan assets

    (8.2 )     (7.9 )     (0.1 )     (0.1 )

Amortization of net actuarial loss

    1.0       1.7       0.1       0.1  

Net periodic benefit

  $ (4.5 )   $ (3.3 )   $     $  

Employer contributions, net

  $ 0.2     $ 0.2     $ 1.3     $ 0.1  
   

Pension Plan and SERP

   

Postretirement Plan

 
   

For the Nine Months Ended September 30,

 
   

2021

   

2020

   

2021

   

2020

 

Interest cost

  $ 8.3     $ 9.8     $ 0.1     $ 0.1  

Expected return on plan assets

    (24.6 )     (22.3 )     (0.2 )     (0.2 )

Amortization of prior service cost (credit)

    0.1       0.1       (0.1 )     (0.1 )

Amortization of net actuarial loss

    2.9       4.6       0.2       0.3  

Net periodic (benefit) cost

  $ (13.3 )   $ (7.8 )   $     $ 0.1  

Employer contributions, net

  $ 0.6     $ 0.6     $ 1.7     $ 0.9