Segment Information - Expenses from exited business (Details) - Reconciling items - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Expenses from exited business included: | ||||
| Amortization of reinsurance loss | $ 21.0 | $ 418.5 | $ 47.9 | $ 429.7 |
| Other impacts of exited business | 28.0 | (169.8) | 127.4 | (136.3) |
| Total expenses from exited business | $ 49.0 | $ 248.7 | $ 175.3 | $ 293.4 |