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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income (loss) from operations before income taxes $ 402.6 $ (27.0) $ 35.1
Income tax (expense)/benefit 132.1 78.1 (5.3)
General, administrative and corporate expenses (503.6) (494.2) (418.0)
Net income/(loss) 534.7 51.1 29.8
Net (loss) 534.7 51.1 29.8
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income/(loss) 25.5 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) (2.2) (3.9) (24.8)
Realized losses on sale of securities and cash and cash equivalents 42.4 58.9 4.4
Income (loss) from operations before income taxes 40.2 55.0 (20.4)
Income tax (expense)/benefit (6.6) 0.0 0.0
Net (loss) 33.6 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 0.0
General, administrative and corporate expenses (8.1) 15.4 (6.2)
Net income/(loss) $ (8.1) $ 15.4 $ (6.2)