Balance Sheet Parenthetical (Parentheticals) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts	$ 7.6	$ 5.3
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	189.6	188.9
Common stock, shares outstanding	101.5	100.8
Treasury stock - shares	88.1	88.2