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Earnings Per Share - Common Stock Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Jan. 03, 2016
Sep. 27, 2015
Jun. 28, 2015
Mar. 29, 2015
Dec. 28, 2014
Sep. 28, 2014
Jun. 29, 2014
Mar. 30, 2014
Jan. 03, 2016
Dec. 28, 2014
Dec. 29, 2013
Earnings Per Share [Abstract]                      
Net earnings $ 34.2 $ 9.1 $ 6.8 $ 3.7 $ 17.0 $ 1.4 $ 2.8 $ 2.5 $ 53.8 [1] $ 23.7 $ 58.9
Less: Earnings allocated to participating securities                 (1.4) (0.7) (1.5)
Net earnings available to common shareholders                 $ 52.4 $ 23.0 $ 57.4
Basic earnings per share on common stock (in dollars per share) $ 0.88 $ 0.23 $ 0.18 $ 0.10 $ 0.44 $ 0.03 $ 0.07 $ 0.07 $ 1.39 [1] $ 0.61 $ 1.54
Diluted earnings per share on common stock (in dollars per share) $ 0.88 $ 0.23 $ 0.18 $ 0.10 $ 0.44 $ 0.03 $ 0.07 $ 0.07 $ 1.39 [1] $ 0.61 $ 1.54
Average common shares outstanding (millions)                      
Basic (in shares)                 37.8 [1] 37.5 37.3
Diluted (in shares)                 37.9 [1] 37.5 37.3
[1] Fiscal year included 53 weeks.