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Note 9 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset/(Liability)

Balance

         
   

December 31,

         
   

2019

   

2018

   

Input Level

 

Trading investments

  $ 20.4     $ 15.7       1  

Interest rate swaps

  $ 4.8     $ (4.8 )     2  

Senior notes, net of unamortized discount and debt issuance costs

  $ (353.1 )   $ (591.3 )     2