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Consolidated Balance Sheets (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accounts and notes receivable, allowances $ 25.6 $ 46.1
Common stock, par value (per share) $ 0.01 $ 0.01
Common stock, shares authorized 426.0 426.0
Common stock, shares issued 181.8 180.5