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Note 13 - Pension and Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
  

Pension Plan and SERP

  

Postretirement Plan

 
  

For the Three Months Ended March 31,

 
  

2021

  

2020

  

2021

  

2020

 
Interest cost $2.8  $3.3  $  $ 
Expected return on plan assets  (8.2)  (7.6)  (0.1)   
Amortization of net actuarial loss  1.0   1.0   0.1    

Net periodic benefit

 $(4.4) $(3.3) $  $ 
Employer contributions (refunds), net $0.2  $0.2  $(0.4) $(0.4)