Investments - Narrative (Details) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
|
Jun. 30, 2025
USD ($)
security
|
Dec. 31, 2024
USD ($)
security
|
|
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Number of available-for-sale investment securities in the twelve month or more category (security) | security | 373 | 518 |
| Weighted average duration of debt securities | 3 years | 3 years 1 month 6 days |
| Sub-prime | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Debt securities | $ 112.9 | $ 161.2 |
| Sub-prime | AAA | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Debt securities | 80.0 | 94.9 |
| Sub-prime | AA | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Debt securities | 13.8 | 31.8 |
| Sub-prime | BBB | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Debt securities | 15.4 | 24.9 |
| Sub-prime | Unrated | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Debt securities | $ 3.7 | 1.4 |
| Sub-prime | A | ||
| Debt and Equity Securities, FV-NI [Line Items] | ||
| Debt securities | $ 8.2 |