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Share-Based Compensation (Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 25, 2019
USD ($)
plan
$ / shares
shares
Dec. 26, 2018
USD ($)
$ / shares
shares
Dec. 27, 2017
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of share-based compensation plans | plan 4    
Shares available for grant (in shares) 700    
Income tax benefits recognized related to share-based compensation | $ $ 1.7 $ 1.6 $ 3.3
Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value (US$ per share) | $ / shares $ 19.02 $ 16.97 $ 12.59
Performance period 3 years    
Cash payments | $ $ 0.4 $ 0.2 $ 3.9
Intrinsic value of units converted | $ 16.9 9.8 $ 5.0
Accrued compensation included as a component of other current liabilities | $ 0.1 0.4  
Accrued compensation included as a component of other noncurrent liabilities | $ 0.2 $ 0.2  
Unrecognized compensation cost related to unvested awards outstanding | $ $ 8.8    
Unrecognized compensation cost, expected weighted average period 1 year 8 months 12 days    
Stock units outstanding (in shares) 1,681 1,688  
Restricted stock units for board members      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards granted (in shares) 100    
Weighted average grant date fair value (US$ per share) | $ / shares $ 19.44    
Performance period 1 year    
Unrecognized compensation cost related to unvested awards outstanding | $ $ 0.3    
Unrecognized compensation cost, expected weighted average period 4 months 24 days    
Stock units converted into common stock 100    
Stock units outstanding (in shares) 700 800  
Minimum | Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target award to be earned 0.00%    
Maximum | Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of target award to be earned 150.00%    
Performance shares that vest based on TSR | Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards granted (in shares) 300    
Weighted average grant date fair value (US$ per share) | $ / shares $ 20.47    
Performance shares that vest based on EBITDA growth | Performance share awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards granted (in shares) 300    
Weighted average grant date fair value (US$ per share) | $ / shares $ 17.58    
2017 Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares) 2,600