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Stock-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Apr. 02, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock-based compensation expense $ 2.2 $ 1.6
Unrecognized compensation cost $ 11.8  
Remaining requisite service period for unrecognized compensation cost 1.5