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Note 4 - Financing Arrangements (Tables)
9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Debt [Table Text Block]
   
September 30, 201
7
   
December 31
, 2016
 
Senior r
evolving line of credit
  $
241.0
    $
139.0
 
Senior notes
   
843.8
     
847.3
 
Total long-term debt
  $
1,084.8
    $
986.3