Segment Information - Revenues from exited business (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
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| Revenues from exited business: | ||||||
| Change in fair value of funds withheld embedded derivative | $ 20.3 | $ 232.9 | $ (189.4) | $ 429.9 | ||
| Net realized capital gains (losses) on funds withheld assets | [1] | 3.7 | 19.0 | 31.7 | 66.5 | |
| Reconciling items | ||||||
| Revenues from exited business: | ||||||
| Change in fair value of funds withheld embedded derivative | 20.3 | 232.9 | (189.4) | 429.9 | ||
| Net realized capital gains (losses) on funds withheld assets | 3.7 | 19.0 | 31.7 | 66.5 | ||
| Amortization of reinsurance gain | 0.6 | 1.0 | 1.1 | 2.1 | ||
| Other impacts of exited business | (8.7) | (8.1) | (15.5) | (11.4) | ||
| Total revenues from exited business | $ 15.9 | $ 244.8 | $ (172.1) | $ 487.1 | ||
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