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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)

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