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Common shares and Treasury stock (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Stock by Class
Change in Number of Shares
Number of ordinary shares
Balance at January 1, 202062,293,508 
of which Common shares66,197,181 
of which Treasury stock(3,903,673)
Issuance of shares under share option and free share plans (1)
231,784 
Storetail deferred consideration(156,859)
Share repurchase program (see Note 2)
(1,728,863)
Balance at December 31, 202060,639,570 
of which Common shares66,272,106 
of which Treasury stock(5,632,536)
Issuance of shares under share option and free share plans (2)
(388,759)
Treasury Shares Issued for RSU Vesting1,573,696 
Treasury Shares Retired1,498,709 
Share repurchase program (3)
(2,647,742)
Balance at December 31, 202160,675,474 
of which Common shares65,883,347 
of which Treasury stock(5,207,873)

(1) Adopted by the Board of Directors on March 3, 2020, April 23, 2020, June 22, 2020, July 23, 2020, October 23, 2020 and December 9, 2020
(2) Adopted by the Board of Directors on February 5, 2021, February 25, 2021, April 29, 2021, June 14, 2021, July 29, 2021, October 28, 2021 and December 15, 2021
(3) Adopted by the Board of Directors on October 28, 2021