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Note 11 - Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 185.8	$ 32.9	$ 536.5	$ 317.7
Weighted-average shares outstanding:
Weighted average number of common shares used in basic EPS (in shares)	162,502,191	163,580,563	162,589,473	163,617,580
Effect of dilutive shares:
Potential common shares issuable from stock options and stock awards (in shares)	3,229,035	3,199,055	2,930,426	3,056,366
Weighted average number of common shares and dilutive potential common shares used in diluted EPS (in shares)	165,731,226	166,779,618	165,519,899	166,673,946

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