Reinsurance - Cost of Reinsurance (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Reinsurance | |||||
| Cost of reinsurance asset | $ 3,061.7 | $ 3,061.7 | $ 3,103.2 | ||
| Cost of reinsurance liability | 953.9 | 953.9 | $ 971.4 | ||
| Cost of reinsurance amortization | $ 15.1 | $ 24.6 | $ 24.3 | $ 44.6 | |