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Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Allowance for doubtful accounts $ 24.2 $ 17.7
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) 161,415,070 162,817,526
Treasury stock (in shares) 382,587,968 381,185,512