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Note 7 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset/(Liability)

Balance

       
   

June 30, 2019

   

December 31, 2018

   

Input Level

 

Trading investments

  $ 19.1     $ 15.7     1  

Interest rate swaps

  $ 4.2     $ (4.8 )   2  

Senior notes, net of unamortized discount and debt issuance costs

  $ (352.5 )   $ (591.3 )   2