Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Allowance for doubtful accounts	$ 10.7	$ 10.8
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	50,000,000
Common stock, shares issued	25,963,037	25,847,269
Common stock, shares outstanding	23,096,970	23,080,110
Treasury stock, shares	2,866,067	2,767,159