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Impairment and Closure Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 25, 2018
Dec. 26, 2017
Impairment and Closure Costs      
Asset Impairment Charges $ (0.9) $ 0.3 $ 0.7
Gain related to the forced relocation 2.6    
Long-lived assets held for use, total gain (loss) 1.2    
Gain to settle a favorable operating lease 1.4    
Operating lease right-of-use assets, Loss 1.1    
Costs associated with the relocation of restaurants $ 0.6