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

Asset/(Liability)

Balance

   
   

September 30, 2019

 

December 31, 2018

 

Input Level

Trading investments

  $ 19.4   $ 15.7   1

Interest rate swaps

  $ 2.9   $ (4.8 ) 2

Senior notes, net of unamortized discount and debt issuance costs

  $ (351.4 ) $ (591.3 ) 2