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Equity-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
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 ended June 30, 2020 and from the date of the Spin-off through June 30, 2019 for the prior year:
|  | Six months ended June 30
(shares in millions) |  | 2020 |  | 2019 |
Unvested at January 1 |  | 4.7 |  | — |
Replacement awards issued at Spin-off(1) |  | — |  | 4.2 |
Granted |  | 2.0 |  | 0.6 |
Vested |  | (1.0 | ) | — |
Forfeited |  | (0.2 | ) | — |
Unvested at June 30 |  | 5.5 |  | 4.8 |
(1) Alcon issued 4.2 million unvested equity-based awards to replace forfeited unvested Novartis awards at the time of the Spin-off.

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- Definition The disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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