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Note 16 - Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income	$ 712.7	$ 449.9	$ 598.7
Weighted average number of common shares used in basic EPS (in shares)	162,610,586	163,535,438	164,808,110
Potential common stock issuable from stock options and stock awards (in shares)	2,710,123	3,024,677	3,489,726
Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares)	165,320,709	166,560,115	168,297,836

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