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Condensed Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Millions
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]      
Allowance for doubtful accounts $ 2.7 $ 1.1 $ 0.5
Preferred stock, shares authorized (shares) 50,000,000   50,000,000
Preferred stock, par value (usd per share) $ 0.01   $ 0.01
Preferred stock, shares issued (shares) 0   0
Preferred stock, shares outstanding (shares) 0   0
Common stock, shares authorized (shares) 300,000,000   300,000,000
Common stock, par value (usd per share) $ 0.01   $ 0.01
Common stock, shares issued (shares) 42,891,431   42,675,171
Common stock shares outstanding (shares) 41,259,085   41,826,136
Treasury shares (in shares) 1,632,346   849,035