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Note 4 - Financing Arrangements (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Debt [Table Text Block]
    June 30, 2016     December 31, 2015  
Senior revolving line of credit
  $ 87.0     $ 148.7  
Senior notes
    870.6       849.3  
Total long-term debt
  $ 957.6     $ 998.0