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Note 7 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Asset/(Liability)

Balance

     
  

March 31, 2022

  

December 31, 2021

  

Input Level

 

Trading investments

 $26.8  $26.0   1 

Interest rate swap

 $1.4  $6.3   2 

Senior notes, net of unamortized discount and debt issuance costs

 $(351.2) $(356.0)  2