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Stock Repurchase Program (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 28, 2016
Jun. 30, 2015
May 22, 2014
Stock Repurchase Program        
Repurchase of common stock authorized by board of directors       $ 100.0
Amount paid for repurchase of common stock $ 3.1 $ 4.1 $ 3.1  
Number of shares repurchased 88,089 114,700 88,089  
Amount remaining under authorized stock repurchase program   $ 69.9