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Note 4 - Financing Arrangements (Tables)
6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Debt [Table Text Block]
    June 30, 2019     December 31, 2018  

Senior revolving line of credit

  $ 76.4     $ 307.1  

Senior notes

    1,295.7       842.0  

Less current portion of long-term debt

    -       (250.7 )

Total long-term debt

  $ 1,372.1     $ 898.4