Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Condensed Consolidated Balance Sheets
Accounts Receivable, Allowance for credit losses	$ 1.0	$ 0.7
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	325,000,000	325,000,000
Common stock, shares issued (in shares)	125,976,027	125,701,889
Common stock, shares outstanding (in shares)	108,757,176	110,656,892
Common stock held in Treasury (in shares)	17,218,851	15,044,997