CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Current assets
Allowance for Doubtful Accounts Receivable, Current	$ 9.5	$ 9.9
Stockholders’ equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	300,000,000.0	300,000,000.0
Common Stock, Shares, Issued	82,900,000	82,200,000
Treasury Stock, Shares	14,300,000	11,800,000