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Shareholders' Equity - Schedule of Ordinary Share Capital (Details)
$ / shares in Units, $ in Millions
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2022
£ / shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
£ / shares
Dec. 31, 2020
$ / shares
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) | shares 40,000,000   761,875,318,444    
Ordinary shares, value, authorized | $ $ 35.7   $ 185.6    
Common stock, shares issued (in shares) | shares 28,944,000   761,864,262,444    
Ordinary shares, value, issued | $ $ 26.5   $ 176.4    
Ordinary shares          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) | shares 40,000,000   40,000,000    
Ordinary shares, value, authorized | $ $ 35.7   $ 35.7    
Common stock, shares issued (in shares) | shares 28,944,000   28,944,000    
Ordinary shares, value, issued | $ $ 26.5   $ 26.5    
Common stock, par value (in GBP per share) | (per share) $ 0.50 £ 0.50 $ 0.50 £ 0.50 $ 0.50
Deferred shares          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares) | shares 0   761,835,318,444    
Ordinary shares, value, authorized | $ $ 0.0   $ 149.9    
Common stock, shares issued (in shares) | shares 0   761,835,318,444    
Ordinary shares, value, issued | $ $ 0.0   $ 149.9    
Common stock, par value (in GBP per share) | £ / shares   £ 0.0001   £ 0.0001