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Note 7 - Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
        
   
March 31, 2019
    
December 31, 2018
    
Input Level
  
Trading investments
   $
18.4
     $
15.7
    
1
  
Interest rate swaps
   $
(4.9
 )   $
(4.8
 )  
2
  
Senior notes, net of unamortized discount and debt issuance costs
   $
(343.4
 )   $
(591.3
 )  
2