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Note 7 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Asset/(Liability)

Balance

     
  

March 31, 2021

  

December 31, 2020

  

Input Level

 

Trading investments

 $23.7  $23.1   1 

Interest rate swap

 $8.0  $12.5   2 

Senior notes, net of unamortized discount and debt issuance costs

 $(357.0) $(361.3)  2