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Note 10 - Debt - Short-term and Long-term Debt (Details) (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
The 4.125% Senior Note Maturing September 12, 2022 [Member]    
Interest rate 4.125% 4.125%
Unamortized discount, current $ 0.6  
Unamortized discount   $ 1.1
The 5.800% Senior Note [Member]    
Interest rate   5.80%
Unamortized discount   $ 0.1
The 3.625% Senior Note [Member]    
Interest rate 3.625% 3.625%
Unamortized discount $ 10.4 $ 10.7
The 4.125% Senior Note [Member]    
Interest rate 4.125% 4.125%
Unamortized discount (premium) $ (11.3) $ (12.4)
The 4.000% Senior Note [Member]    
Interest rate 4.00% 4.00%
Unamortized discount $ 4.5 $ 5.4
The 5.500% Senior Note [Member]    
Interest rate 5.50% 5.50%
Unamortized discount $ 4.2 $ 4.3