Segment Information - Expenses from exited business (Details) - Reconciling items - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Expenses from exited business included: | ||||
| Amortization of reinsurance loss | $ 14.4 | $ 18.8 | $ 53.9 | $ 66.7 |
| Other impacts of exited business | 30.5 | 28.6 | 87.6 | 156.0 |
| Total expenses from exited business | $ 44.9 | $ 47.4 | $ 141.5 | $ 222.7 |