Condensed Consolidated Balance Sheets Parentheticals (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Allowance for doubtful accounts	$ 10.0	$ 9.6
Stockholders' equity:
Common stock, par value per share	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	12,545,372	12,382,724
Common stock, shares outstanding	11,489,795	11,344,947
Treasury stock, shares	1,055,577	1,037,777