Condensed Consolidated Balance Sheets Parentheticals (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Allowance for doubtful accounts	$ 9.9	$ 9.6
Stockholders' equity:
Common stock, par value	$ 0.01	$ 0.01
Common shares, authorized	50,000,000	50,000,000
Common shares, issued	12,474,589	12,382,724
Common shares, outstanding	11,419,012	11,344,947
Treasury stock	1,055,577	1,037,777