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Related parties transactions
 12 Months Ended
Dec. 31, 2023
Related Party [Abstract]  
Related parties transactions Related parties transactions
Executive officers
The following table summarizes compensation information for key management personnel:
($ millions)202320222021
Cash and other compensation20.1 18.7 19.3 
Post-employment benefits1.1 0.9 0.9 
Equity-based compensation23.1 22.4 20.9 
Total44.3 42.0 41.1 
Investment in an associated company
In December 2023, Alcon acquired approximately 8.5% voting interest of an associated company for $10 million which was accounted for using the equity method based on Alcon's ability to exercise significant influence. Subsequent to the acquisition of the voting interest, Alcon paid $3 million to extend the duration of its option to acquire certain exclusive commercialization rights from the associated company and recognized an intangible asset in the Consolidated Balance Sheet. Long-term convertible notes due from the associated company included in Financial assets on the Consolidated Balance Sheet amounted to $11 million as of December 31, 2023.