v3.26.3
(Loss) Income Per Share - Schedule of (Loss) Income Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2026
Sep. 25, 2025
Oct. 01, 2026
Sep. 25, 2025
Earnings Per Share [Abstract]        
Net (loss) income attributable to NCM, Inc. (in millions) $ (17.2) $ 1.6 $ (55.8) $ (39.9)
Weighted average shares outstanding:        
Basic (in shares) 94,051,204 93,701,506 93,652,200 94,354,866
Add: Dilutive effect of stock options, restricted stock and exchangeable membership units (in shares) 0 609,834 0 0
Diluted (in shares) 94,051,204 94,311,340 93,652,200 94,354,866
(Loss) income per NCM, Inc. share:        
Basic (in usd per share) $ (0.18) $ 0.02 $ (0.6) $ (0.42)
Diluted (in usd per share) $ (0.18) $ 0.02 $ (0.6) $ (0.42)