v3.26.1
Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Realized losses on sale of securities $ (67.0) $ (60.6) $ (41.5)
Income from operations before income taxes 444.1 464.1 402.6
Income tax (expense)/benefit (103.9) 22.0 132.1
General, administrative and corporate expenses [1] (671.4) (533.1) (503.6)
Net income/(loss) 340.2 486.1 534.7
Net realized and unrealized foreign exchange gains/(losses) 51.6 (14.1) 14.4
Income tax expense, foreign currency translation adjustments (1.6) 1.4 0.0
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income/(loss) 33.8 48.6 25.5
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) (25.8) (3.2) (2.2)
Realized losses on sale of securities 68.8 62.6 42.4
Income from operations before income taxes 43.0 59.4 40.2
Income tax (expense)/benefit (8.7) (11.5) (6.6)
Net income/(loss) 34.3 47.9 33.6
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 (0.2) 0.0
General, administrative and corporate expenses (0.7) 0.9 (8.1)
Net income/(loss) $ (0.5) $ 0.7 $ (8.1)
[1] General, administrative and corporate expenses includes related party management consulting fees of $1.8 million (2024 — $5.0 million; 2023 — $5.0 million).