Segment Information - Revenues from exited business (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
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| Revenues from exited business: | ||||||
| Change in fair value of funds withheld embedded derivative | $ 818.2 | $ (265.9) | $ 891.2 | $ (455.3) | ||
| Net realized capital gains (losses) on funds withheld assets | [1] | (17.0) | (0.2) | (15.7) | 31.5 | |
| Reconciling items | ||||||
| Revenues from exited business: | ||||||
| Change in fair value of funds withheld embedded derivative | 818.2 | (265.9) | 891.2 | (455.3) | ||
| Net realized capital gains (losses) on funds withheld assets | (17.0) | (0.2) | (15.7) | 31.5 | ||
| Amortization of reinsurance gain | 0.4 | 0.5 | 1.7 | 1.6 | ||
| Other impacts of exited business | (284.8) | (5.7) | (298.6) | (21.2) | ||
| Total revenues from exited business | $ 516.8 | $ (271.3) | $ 578.6 | $ (443.4) | ||
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