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Share Capital and Reserves - Summary of Share Capital (Parenthetical) (Detail) - € / shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Ordinary shares [member]    
Disclosure of classes of share capital [line items]    
Par value per share € 0.32 € 0.32
Percentage of shares representing in total issued share capital 99.53% 93.71%
Cancellation of treasury shares [1],[2] 21,000,000 4,000,000
Ordinary shares [member] | Cancellation Of Income Shares [Member]    
Disclosure of classes of share capital [line items]    
Cancellation of treasury shares 21,000,000 4,500,000
Income Shares [member]    
Disclosure of classes of share capital [line items]    
Par value per share € 0.02 € 0.02
Percentage of shares representing in total issued share capital   5.86%
Cancellation of treasury shares [1]   4,000,000
[1] During 2021, 21,000,000 Ordinary Shares (2020: 4,500,000 Ordinary Shares including Income Shares) were cancelled. The amount paid to repurchase these shares was initially recognised in Treasury Shares/own shares and was transferred to retained income on cancellation.
[2] The Ordinary Shares represent 99.53% of the total issued share capital as at 31 December 2021 (2020: 93.71%).