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Loss Per Share (Tables)
3 Months Ended
Sep. 29, 2022
Earnings Per Share [Abstract]  
Schedule of Loss Per Share, Basic and Diluted The components of basic and diluted loss per NCM, Inc. share are as follows:
Three Months EndedNine Months Ended
September 29, 2022September 30, 2021September 29, 2022September 30, 2021
Net loss attributable to NCM, Inc. (in millions)$(8.9)$(15.2)$(34.8)$(57.3)
Weighted average shares outstanding:
Basic81,605,806 80,359,723 81,371,370 79,652,152 
Add: Dilutive effect of stock options, restricted stock and
   exchangeable membership units
— — — — 
Diluted81,605,806 80,359,723 81,371,370 79,652,152 
Loss per NCM, Inc. share:
Basic$(0.11)$(0.19)$(0.43)$(0.72)
Diluted$(0.11)$(0.19)$(0.43)$(0.72)