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Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income (loss) from operations before income taxes $ (27.0) $ 35.1 $ (38.0)
Income tax (expense)/benefit 78.1 (5.3) (18.4)
General, administrative and corporate expenses (494.2) [1] (418.0) (410.9)
Net income/(loss) 51.1 29.8 (56.4)
Net (loss) 51.1 29.8 $ (56.4)
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income/(loss) 70.4 (26.6)  
Available for sale securities | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Available for sale securities — gross realized (losses) (3.9) (24.8)  
Realized losses on sale of securities and cash and cash equivalents 58.9 4.4  
Income (loss) from operations before income taxes 55.0 (20.4)  
Income tax (expense)/benefit 0.0 0.0  
Net (loss) 55.0 (20.4)  
Realized derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax (expense)/benefit 0.0 0.0  
General, administrative and corporate expenses 15.4 (6.2)  
Net income/(loss) $ 15.4 $ (6.2)  
[1] General, administrative and corporate expenses includes related party management consulting fees of $5.0 million (2021 — $5.0 million; 2020 — $5.0 million).