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Taxation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Income Tax Examination [Line Items]        
Loss before income taxes $ (14.2) $ 159.0 $ (22.1) $ 205.5
Bermuda        
Income Tax Examination [Line Items]        
Loss before income taxes $ 15.4 $ 8.3 $ 30.0 $ 18.9