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Shareholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2022 £ / shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 £ / shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cancellation of deferred shares |  | $ 0.1 |  |  |  |  |  |
Purchase of treasury shares |  | 11.1 | $ 6.4 |  |  |  |  |
Number of treasury shares held (in shares) | shares |  |  |  |  | 1,277,766 |  | 575,618 |
Cancellation of treasury shares |  |  | 0.0 |  |  |  |  |
Cost of treasury shares held |  |  |  |  | $ 20.4 |  | $ 9.6 |
Additional paid-in capital |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cancellation of deferred shares |  | $ (149.8) |  |  |  |  |  |
Cancellation of treasury shares |  |  | $ 0.6 |  |  |  |  |
June 2021 Share Buy-Back Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of ordinary shares repurchased (in shares) | shares |  |  | 297,678 |  |  |  |  |
Purchase of treasury shares |  |  | $ 6.4 |  |  |  |  |
Shares utilized (in shares) | shares |  |  | 16,395 |  |  |  |  |
Utilization of treasury shares |  |  | $ 0.1 |  |  |  |  |
Number of treasury shares held (in shares) | shares |  |  |  |  |  |  | 225,283 |
Number of treasury shares cancelled (in shares) | shares |  |  | 56,000 |  |  |  |  |
Cancellation of treasury shares |  |  | $ 0.7 |  |  |  |  |
2022 Share Buy-Back Program |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of ordinary shares repurchased (in shares) | shares |  | 711,572 |  |  |  |  |  |
Purchase of treasury shares |  | $ 11.1 |  |  |  |  |  |
Shares utilized (in shares) | shares |  | 9,424 |  |  |  |  |  |
Utilization of treasury shares |  | $ 0.3 |  |  |  |  |  |
Number of treasury shares held (in shares) | shares |  |  |  |  | 702,148 |  |  |
Ordinary shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in GBP per share) | (per share) |  |  |  | £ 0.50 | $ 0.50 | £ 0.50 | $ 0.50 | $ 0.50
Common stock, shares, outstanding, actively traded (in shares) | shares |  |  |  |  | 26,934,973 |  | 27,529,824 |
Ordinary shares | Own shares held by ESOP |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares |  |  |  | 0.50 |  | 0.50 |  |
Number of ESOP shares (in shares) | shares |  |  |  |  | 721,261 |  | 838,558 |
Deferred shares |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, par value (in GBP per share) | £ / shares |  |  |  | £ 0.0001 |  | £ 0.0001 |  |
Cancellation of deferred shares | $ 0.1 |  |  |  |  |  |  |
Number of ESOP shares (in shares) | shares |  |  |  |  | 0 |  | 15,977,968,688 |
Deferred shares | Additional paid-in capital |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Cancellation of deferred shares | $ 149.8 |  |  |  |  |  |  |

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