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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Dec. 29, 2016
Accounting Policies [Abstract]        
Short-term investments $ 0.5 $ 0.9    
Net gain on investments 0.9 0.1 $ 0.5  
Deferred compensation plan investments 11.2 10.2    
Cash overdrafts 4.1 4.4    
Discounted insurance liabilities $ 19.2 $ 21.1    
Self insurance liabilities, discount rate 1.50% 1.00%    
Undiscounted insurance liabilities $ 20.0 $ 21.6    
Revenue recognized in breakage on gift cards 0.3 0.3 0.4  
Initial franchise fees 2.6 2.3 1.8  
Deferred fees 2.1 1.9    
Advertising expense 13.1 12.5 12.3  
Advertising contributions from franchisees $ 76.5 $ 72.5 $ 70.3  
Paid-in Capital [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 0.6
Other Current Assets [Member] | Minimum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       6.0
Other Current Assets [Member] | Maximum [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ 10.0