CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Current assets
Allowance for Doubtful Accounts Receivable, Current	$ 15.2	$ 16.2
Stockholders’ equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized	300,000,000	300,000,000
Common Stock, Shares, Issued	81,300,000	130,400,000
Treasury Stock, Shares	11,700,000	50,200,000