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Note 9 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Asset/(Liability)

Balance

     
  

December 31,

     
  

2020

  

2019

  

Input Level

 

Trading investments

 $23.1  $20.4   1 

Interest rate swap

 $12.5  $4.8   2 

Senior notes, net of unamortized discount and debt issuance costs

 $(361.3) $(353.1)  2