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Share capital and reserves - Ordinary Shares (Details) - Ordinary shares - shares
shares in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of number of shares outstanding [abstract]    
Number of shares outstanding, beginning balance (in shares) 172.2 194.5
Shares issued in the year 5.0 7.6
Shares repurchased in the year 3.6 29.9
Number of shares outstanding, ending balance (in shares) 173.6 172.2