CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Preferred stock, no par value
Preferred stock, shares authorized	25.0	25.0
Preferred stock, issued
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	450.0	450.0
Common stock, shares issued	197.9	197.9
Treasury stock, shares	64.5	57.8