Balance Sheet Parenthetical (Parentheticals) (USD $) In Millions, except Per Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Allowance for doubtful accounts	$ 7.2	$ 5.9
Preferred stock, par value	$ 0	$ 0
Preferred stock, shares authorized	5.0	5.0
Preferred stock, shares outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.0	$ 0
Common stock, shares authorized	500.0	500.0
Common stock, shares issued	188.9	187.5
Common stock, shares outstanding	101.7	105.9
Treasury stock - shares	87.2	81.6