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Basis of Presentation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Basis of Presentation        
Number of weeks in each fiscal quarter for 52-week fiscal year     91 days  
Income Per Common Share        
Basic (in shares) 38,370,000 40,998,000 38,315,000 40,433,000
Dilutive effect of stock options and restricted stock (in shares) 618,000 1,066,000 610,000 1,108,000
Dilutive effect of convertible notes (in shares)   938,000   1,239,000
Diluted weighted average shares outstanding (in shares) 38,988,000 43,002,000 38,925,000 42,780,000
Dilutive effect of assumed conversion of convertible debt (in shares)   900,000   1,200,000
Derivative Financial Instruments        
Aggregate foreign currency exchange loss $ 0.3 $ 0.1 $ 0.3 $ 0.4
Forward contracts losses (gains) included in aggregate foreign currency exchange losses 0.2 (0.3) 0.1 (0.8)
Notional amount of monthly forward contracts 0.6   0.6  
Weighted average notional amount of derivative contracts $ 1.3   $ 2.5