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The Company (Changes In Equity) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jul. 02, 2015
Jun. 30, 2016
Jul. 02, 2015
General Company Information [Line Items]        
Net income attributable to NCM, Inc. $ 6.8 $ 10.1 $ 2.5 $ 1.1
NCM LLC equity issued for purchase of intangible asset     21.1 31.4
Income tax and other impacts of NCM LLC ownership changes     (2.3) (2.4)
Change from net income attributable to NCM, Inc. and transfers from noncontrolling interests     8.0 9.8
Additional Paid In Capital (Deficit) [Member]        
General Company Information [Line Items]        
NCM LLC equity issued for purchase of intangible asset     9.2 14.1
Income tax and other impacts of NCM LLC ownership changes     $ (3.7) $ (5.4)