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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Allowance for accounts receivable $ 2.3 $ 2.0
Held-to-maturity, allowance for credit loss $ 0.6 $ 0.5
Preferred stock, par value (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (shares) 50,000,000 50,000,000
Preferred stock, shares issued (shares) 0 0
Preferred stock, shares outstanding (shares) 0 0
Common stock, par value (usd per share) $ 0.01 $ 0.01
Common stock, shares authorized (shares) 300,000,000 300,000,000
Common stock, shares issued (shares) 43,212,857 43,102,011
Common stock shares outstanding (shares) 37,358,879 39,269,399
Treasury stock (shares) 5,853,978 3,832,612