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Taxation - Tax rate (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of non-adjusting events after reporting period [line items]          
Main rate of UK corporation tax 25.00%     19.00% 19.00%
Change in tax rate announced          
Disclosure of non-adjusting events after reporting period [line items]          
Main rate of UK corporation tax   19.00% 19.00%