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Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 29, 2018
Mar. 30, 2017
Dec. 27, 2018
Dec. 28, 2017
Dec. 29, 2016
Finite-Lived Intangible Assets [Line Items]          
Payments from related parties, theater payments     $ 22.7 $ 12.9 $ 2.4
Intangible assets, net of accumulated amortization     684.5 717.2 560.5
Amortization expense     27.3 26.5  
Related Party Founding Members          
Finite-Lived Intangible Assets [Line Items]          
Payments from related parties, theater payments     17.2 12.9 2.4
Intangible assets, net of accumulated amortization     $ 657.6 687.1  
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur     (2.00%)    
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Percentage increase (decrease) in theater attendance for Common Unit adjustment to occur     2.00%    
NCM, LLC.          
Finite-Lived Intangible Assets [Line Items]          
Increase (decrease) in intangible assets, net $ 0.0 $ 0.0      
Amortization expense     $ 27.3 26.5 $ 27.0
NCM, LLC. | Computer Software, Intangible Asset          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ 0.1 $ 0.1  
Weighted average remaining life     1 year 6 months 2 years 6 months  
NCM, LLC. | AMC and Cinemark          
Finite-Lived Intangible Assets [Line Items]          
Increase (decrease) in intangible assets, net     $ 0.0 $ 0.0  
Payments from related parties, theater payments     0.0 0.0  
NCM, LLC. | Related Party Founding Members          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ 657.6 $ 687.1  
Weighted average remaining life     18 years 2 months 17 days 19 years 2 months 12 days  
NCM, LLC. | Network Affiliates          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets, net of accumulated amortization     $ 26.9 $ 30.0  
Weighted average remaining life     10 years 11 years