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Note 15 - Debt - Short-term and Long-term Debt (Details) (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2020	May 08, 2020	Dec. 31, 2019
The 5.800% Senior Note [Member]
Interest rate	5.80%		5.80%
Unamortized premium	$ 0.1
Unamortized discount			$ 0.7
The 3.625% Senior Note [Member]
Interest rate	3.625%	3.625%
Unamortized discount	$ 10.7	$ 5.2
The 4.125% Senior Note [Member]
Interest rate	4.125%		4.125%
Unamortized discount	$ 12.4		$ 13.9
The 4.000% Senior Note [Member]
Interest rate	4.00%		4.00%
Unamortized discount	$ 5.4		$ 6.7
The 5.500% Senior Note [Member]
Interest rate	5.50%		5.50%
Unamortized discount	$ 4.3		$ 4.5
The 4.125% Senior Note Maturing September 12, 2022 [Member]
Interest rate	4.125%		4.125%
Unamortized discount	$ 1.1		$ 1.6

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-SubTopic 10
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Amount, after accumulated amortization, of debt discount.

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