Consolidated Balance Sheets (Parenthetical) shares in Millions, $ in Millions	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) shares
Accounts and notes receivable, allowances | $	$ 103.7	$ 96.5
Common stock, par value (per share) | (per share)	$ 0.01
Common stock, shares authorized	426.0	426.0
Common stock, shares issued	180.5	202.4
Treasury stock, shares	0.0	19.9