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Note 7 - Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
Asset/(Liability)
Balance
        
    September 30, 2018     December 31, 2017     Input Level  
Trading investments
   $
17.5
     $
16.4
    
1
  
Interest rate swaps
   $
(16.0
 )   $
(1.4
 )  
2
  
Senior notes, net of unamortized discount and debt issuance costs
   $
(581.8
 )   $
(595.6
 )  
2