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Note 13 - Pension and Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2023
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Pension Plan and SERP

  

Postretirement Plan

 
  

For the Three Months Ended June 30,

 
  

2023

  

2022

  

2023

  

2022

 

Interest cost

 $4.4  $3.5  $  $0.1 

Expected return on plan assets

  (6.0)  (7.6)     (0.1)

Amortization of prior service cost

  0.1          

Amortization of net actuarial loss

  1.2   0.7      0.1 

Net periodic (benefit) cost

 $(0.3) $(3.4) $  $0.1 

Employer contributions, net

 $0.3  $0.2  $0.2  $0.4 
  

Pension Plan and SERP

  

Postretirement Plan

 
  

For the Six Months Ended June 30,

 
  

2023

  

2022

  

2023

  

2022

 

Interest cost

 $8.7  $6.3  $  $0.2 

Expected return on plan assets

  (12.2)  (15.8)     (0.2)

Amortization of prior service cost

  0.1   0.1       

Amortization of net actuarial loss

  2.7   1.2      0.2 

Net periodic (benefit) cost

 $(0.7) $(8.2) $  $0.2 

Employer contributions, net

 $1.3  $0.4  $0.8  $0.7