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Directors' and key management remuneration (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure Of Information About Key Management Personnel [Abstract]  
Summary of aggregate remuneration
Aggregate remuneration, calculated in accordance with the UK Companies Act 2006, of the directors of the parent companies was as follows:

2021
US$'000
2020
US$'000
2019
US$'000
Emoluments
6,568 6,686 7,524 
Long-term incentive plans
1,587 8,974 4,748 

8,155 15,660 12,272 
Pension contributions: defined contribution plans
9 29 42 
Gains made on exercise of share options
— — — 
Summary of aggregate compensation, representing the expense
Aggregate compensation, representing the expense recognised under IFRS, as defined in note 1, of the Group’s key management, including directors, was as follows:

2021
US$'000
2020
US$'000
2019
US$'000
Short-term employee benefits and costs
18,184 21,685 22,075 
Post-employment benefits
300 369 477 
Employment termination benefits
— 2,789 310 
Share-based payments
10,303 34,954 17,632 
Total
28,787 59,797 40,494