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Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 27, 2015
Sep. 28, 2014
Earnings Per Share [Abstract]        
Net earnings $ 9.1 $ 1.4 $ 19.6 $ 6.7
Less: earnings allocated to participating securities (0.2) 0.0 (0.5) (0.2)
Net earnings available to common shareholders $ 8.9 $ 1.4 $ 19.1 $ 6.5
Basic earnings per share on common stock (in dollars per share) $ 0.23 $ 0.03 $ 0.51 $ 0.17
Diluted earnings per share on common stock (in dollars per share) $ 0.23 $ 0.03 $ 0.51 $ 0.17
Average common shares outstanding (millions):        
Basic (in shares) 37.9 37.6 37.8 37.5
Diluted (in shares) 37.9 37.6 37.8 37.5