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Note 3 - Financing Arrangements (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
   
December 31,
 
   
201
7
   
201
6
 
Senior revolving line of credit
  $
241.4
    $
139.0
 
Senior notes
   
844.2
     
847.3
 
Total long-term debt
  $
1,085.6
    $
986.3