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Note 7 - Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
  

Asset/(Liability)

Balance

     
  September 30, 2020  December 31, 2019  Input Level 

Trading investments

 $21.3  $20.4   1 

Interest rate swap

 $10.9  $4.8   2 

Senior notes, net of unamortized discount and debt issuance costs

 $(360.0) $(353.1)  2