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CONSOLIDATED BALANCE SHEET Parenthetical - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2017
Dec. 31, 2016
Current assets    
Allowance for Doubtful Accounts Receivable, Current $ 16.2 $ 16.5
Stockholders’ equity    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common Stock, Shares Authorized 300.0 300.0
Common Stock, Shares, Issued 130.4 129.6
Treasury Stock, Shares 50.2 24.6