Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
CURRENT ASSETS:
Allowances, accounts and notes receivable	$ 13.5	$ 12.8
PROPERTY, PLANT AND EQUIPMENT
Accumulated depreciation	$ 601.1	$ 584.7
STOCKHOLDERS' EQUITY:
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	86,648,631	86,480,816
Treasury stock, shares	35,090,313	32,784,503