Taxation - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2022 |
Dec. 31, 2021 |
|
| Reconciliation of Liabilities Related to Unrecognized Tax Benefits [Roll Forward] | ||
| Unrecognized tax benefits, excluding interest and penalties, at January 1, | $ 6.2 | $ 6.2 |
| Unrecognized tax benefits, excluding interest and penalties, at December 31, | 6.2 | 6.2 |
| Interest and penalties | 5.1 | 4.6 |
| Unrecognized tax benefits, including interest and penalties, at December 31, | $ 11.3 | $ 10.8 |