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Note 4 - Financing Arrangements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Debt [Table Text Block]
   
March 31, 2018
   
December 31, 2017
 
Senior revolving line of credit
  $
167.2
    $
241.4
 
Senior notes
   
832.8
     
844.2
 
Less current portion of long-term debt
   
(247.6
)    
-
 
Total long-term debt
  $
752.4
    $
1,085.6