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Equity-based compensation (Tables)
6 Months Ended
Jun. 30, 2021
Share-Based Payment Arrangements [Abstract]  
Summary of unvested share movements
The below table summarizes unvested share movements for all Alcon equity-based incentive plans for the six months June 30, 2021 and 2020:
Six months ended June 30
(shares in millions)20212020
Unvested at January 15.4 4.7 
Granted1.8 2.0 
Vested(1.1)(1.0)
Forfeited(0.2)(0.2)
Unvested at June 305.9 5.5