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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized losses on sale of securities $ (60.6) $ (41.5) $ (58.4)
Income (loss) from operations before income taxes 464.1 402.6 (27.0)
Income tax (expense)/benefit 22.0 132.1 78.1
General, administrative and corporate expenses (533.1) (503.6) (494.2)
Net income/(loss) 486.1 534.7 51.1
Net realized and unrealized foreign exchange gains/(losses) (14.1) 14.4 (30.9)
Income tax expense, foreign currency translation adjustments 1.4 0.0 0.0
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income/(loss) 48.6 25.5 70.4
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) (3.2) (2.2) (3.9)
Realized losses on sale of securities 62.6 42.4 58.9
Income (loss) from operations before income taxes 59.4 40.2 55.0
Income tax (expense)/benefit (11.5) (6.6) 0.0
Net income/(loss) 47.9 33.6 55.0
Realized derivatives | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Income tax (expense)/benefit (0.2) 0.0 0.0
General, administrative and corporate expenses 0.9 (8.1) 15.4
Net income/(loss) $ 0.7 $ (8.1) $ 15.4