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Investments - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 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 | 461 | 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 | $ 137.3 | $ 161.2
Sub-prime | AAA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt securities | 82.2 | 94.9
Sub-prime | AA |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt securities | 28.1 | 31.8
Sub-prime | A |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt securities | 7.2 | 8.2
Sub-prime | BBB |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt securities | 15.8 | 24.9
Sub-prime | Unrated |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt securities | $ 4.0 | $ 1.4

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