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Note 7 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
         
   
March 31, 2018
   
December 31, 2017
   
Input Level
 
Trading investments
  $
16.4
    $
16.4
     
1
 
Interest rate swaps
  $
(13.1
)   $
(1.4
)    
2
 
Senior notes, net of unamortized discount and debt issuance costs
  $
(584.2
)   $
(595.6
)    
2