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Earnings per Share and Stock Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Jul. 27, 2015
Net (loss) income      
Net income $ 28.2 $ 21.7  
Shares      
Shares (in shares) 34,300,000 34,400,000  
Per Share Amount      
Net income (in dollars per share) $ 0.82 $ 0.63  
Dilutive securities, principally common stock options      
Common stock equivalents (in shares) 100,000 100,000  
Net (loss) income      
Net income $ 28.2 $ 21.7  
Weighted average number of shares:      
Shares (in shares) 34,400,000 34,500,000  
Securities not included in the computation of diluted EPS      
Net income (in dollars per share) $ 0.82 $ 0.63  
Dilutive securities, principally common stock options      
Options to purchase shares of Class A common stock, anti-dilutive 0 100,000  
Shares repurchased      
Number of shares repurchased 80,055 69,112  
Cost of shares repurchased $ 6.2 $ 4.4  
Class A      
Shares repurchased      
Total value of shares of the entity's Class A common stock authorized to be repurchased     $ 100.0
Remaining authorized repurchase amount $ 31.6