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Related Party Transactions (Summary of Transactions Between the Company and the Founding Members Included in Balance Sheets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 28, 2017
Dec. 27, 2018
Dec. 29, 2016
Related Party Transaction [Line Items]      
Current portion of notes receivable - founding members $ 4.2 $ 5.6  
Long-term portion of note receivable - founding members 4.1 0.0  
Intangible assets, net of accumulated amortization 717.2 684.5 $ 560.5
Current payable to founding members under tax receivable agreement 19.6 15.5  
Long-term payable to founding members under tax receivable agreement 212.6 195.6  
Related Party Founding Members      
Related Party Transaction [Line Items]      
Current portion of notes receivable - founding members 4.2 4.2  
Long-term portion of note receivable - founding members 4.1 0.0  
Interest receivable on notes receivable (included in other current assets) 0.0 0.1  
Intangible assets, net of accumulated amortization 687.1 657.6  
Current payable to founding members under tax receivable agreement 19.6 11.2  
Long-term payable to founding members under tax receivable agreement 212.6 $ 141.1  
Tax Year 2017      
Related Party Transaction [Line Items]      
Payment to founding members under TRA 18.4    
Tax Year 2016      
Related Party Transaction [Line Items]      
Payment to founding members under TRA $ 18.8