Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accounts and notes receivable, allowances	$ 27.3	$ 25.6
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	426,000,000.0	426,000,000
Common shares, issued	181,600,000	181,800,000