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Reclassifications from Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Reclassification (Details) - USD ($) $ in Millions | 12 Months Ended
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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).

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