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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
Dec. 29, 2016
Dec. 31, 2015
Jan. 01, 2015
Related Party Transaction [Line Items]      
Current portion of notes receivable - founding members [1] $ 5.6 $ 4.2  
Long-term portion of note receivable - founding members [1] 8.3 12.5  
Interest receivable on notes receivable (included in other current assets) 0.3    
Intangible assets, net of accumulated amortization 560.5 566.7 $ 488.6
Current payable to founding members under tax receivable agreement 18.4 26.2  
Long-term payable to founding members under tax receivable agreement 143.4 140.3  
Common Unit Adjustments, Net of Amortization And Integration Payments [Member]      
Related Party Transaction [Line Items]      
Intangible assets, net of accumulated amortization $ 529.9 $ 535.9  
[1] Refer to the discussion of the Fathom Events sale under AC JV, LLC transactions below.