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Stock Repurchase Program (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jul. 01, 2014
Jun. 30, 2015
Jul. 01, 2014
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 $ 7.6 $ 3.1 $ 31.8  
Number of shares repurchased 88,089 300,000 88,089 1,260,000  
Amount remaining under authorized stock repurchase program $ 82.3   $ 82.3