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Note 9 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
   
Input Level
 
Trading investments
  $ 13.6       1  
Interest rate swap
  $ 6.1       2  
Senior notes
  $ (605.2 )     2