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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

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