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Note 7 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset/(Liability)

Balance

       
   

March 31, 2020

   

December 31, 2019

   

Input Level

 

Trading investments

  $ 17.9     $ 20.4     1  

Interest rate swaps

  $ 11.4     $ 4.8     2  

Senior notes, net of unamortized discount and debt issuance costs

  $ (360.1 )   $ (353.1 )   2