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Note 7 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]    
Trading investments $ 19.4 $ 15.7
Fair Value, Inputs, Level 2 [Member]    
Interest rate swaps, assets 2.9  
Interest rate swaps, liabilities   (4.8)
Senior notes, net of unamortized discount and debt issuance costs $ (351.4) $ (591.3)