Reinsurance - Cost of Reinsurance (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
|
| Reinsurance | |||||
| Cost of reinsurance asset | $ 3,147.3 | $ 3,147.3 | $ 3,187.6 | ||
| Cost of reinsurance liability | 962.9 | 962.9 | $ 958.1 | ||
| Cost of reinsurance amortization | $ 24.6 | $ 453.6 | $ 44.6 | $ 459.1 | |