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Note 7 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   

Asset/(Liability)

Balance

   

Input Level

 

Trading investments

  $ 14.0       1  

Interest rate swap

  $ 2.5       2  

Senior notes

  $ (252.4 )     2