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Note 4 - Financing Arrangements (Tables)
6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
    June 30, 2017     December 31, 2016  
Senior revolving line of credit
  $
94.4
    $
139.0
 
Senior notes
   
848.8
     
847.3
 
Total long-term debt
  $
943.2
    $
986.3