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Note 7 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
   
Input Level
 
Trading investments
  $ 14.5       1  
Interest rate swap
  $ 26.8       2  
Senior notes
  $ (622.4 )     2