Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Allowance for doubtful accounts	$ 11.3	$ 10.9
Stockholders' equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	26,097,193	25,976,677
Common stock, shares outstanding	23,156,234	23,058,335
Treasury stock, shares	2,940,959	2,918,342