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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Allowance for doubtful accounts	$ 17.7	$ 21.3
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	2,000,000,000	2,000,000,000
Common stock issued (in shares)	544,003,038	544,003,038
Common stock outstanding (in shares)	156,842,018	161,651,639
Treasury stock (in shares)	387,161,020	382,351,399

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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