CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) shares in Thousands	Mar. 31, 2024 $ / shares shares	Mar. 31, 2024 £ / shares shares	Dec. 31, 2023 $ / shares shares	Dec. 31, 2023 £ / shares shares
Deferred stock, par value (in dollars per share) | $ / shares	$ 0.000001		$ 0.000001
Deferred stock, issued (in shares)	388,927	388,927	384,640	384,640
Deferred stock, outstanding (in shares)	388,927	388,927	384,640	384,640
Class A Ordinary Shares
Common stock, par value (in dollars/pounds per share) | $ / shares	$ 0.0001		$ 0.0001
Common stock, issued (in shares)	450,981	450,981	446,692	446,692
Common stock, outstanding (in shares)	450,981	450,981	446,692	446,692
Class B Ordinary Shares
Common stock, par value (in dollars/pounds per share) | $ / shares	$ 0.000001		$ 0.000001
Common stock, issued (in shares)	146,456	146,456	150,743	150,743
Common stock, outstanding (in shares)	146,456	146,456	150,743	150,743
Class R Redeemable Shares
Common stock, par value (in dollars/pounds per share) | £ / shares		£ 1		£ 1
Common stock, issued (in shares)	50	50	50	50
Common stock, outstanding (in shares)	50	50	50	50