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Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Assets: |  |
Fixed maturities | $ 708.8 | $ 607.4
Short term investments | 14.1 | 27.5
Total | 722.9 | 634.9
Fair value of warrant liability (less than) | 0.1 | 0.1
Corporate debt securities |  |
Financial Assets: |  |
Fixed maturities | 501.2 | 470.8
U.S. Government obligations |  |
Financial Assets: |  |
Fixed maturities | 140.1 | 107.7
Asset-backed securities |  |
Financial Assets: |  |
Fixed maturities | 45.5 | 22.9
Non-U.S. government obligations |  |
Financial Assets: |  |
Fixed maturities | 22.0 | 6.0
Warrant liability |  |
Financial Assets: |  |
Warrant liability | 0.0 | 0.0
Level 1 |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Short term investments | 0.0 | 0.0
Total | 0.0 | 0.0
Level 1 | Corporate debt securities |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 1 | U.S. Government obligations |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 1 | Asset-backed securities |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 1 | Non-U.S. government obligations |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 1 | Warrant liability |  |
Financial Assets: |  |
Warrant liability | 0.0 | 0.0
Level 2 |  |
Financial Assets: |  |
Fixed maturities | 708.8 | 607.4
Short term investments | 14.1 | 27.5
Total | 722.9 | 634.9
Level 2 | Corporate debt securities |  |
Financial Assets: |  |
Fixed maturities | 501.2 | 470.8
Level 2 | U.S. Government obligations |  |
Financial Assets: |  |
Fixed maturities | 140.1 | 107.7
Level 2 | Asset-backed securities |  |
Financial Assets: |  |
Fixed maturities | 45.5 | 22.9
Level 2 | Non-U.S. government obligations |  |
Financial Assets: |  |
Fixed maturities | 22.0 | 6.0
Level 2 | Warrant liability |  |
Financial Assets: |  |
Warrant liability | 0.0 | 0.0
Level 3 |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Short term investments | 0.0 | 0.0
Total | 0.0 | 0.0
Level 3 | Corporate debt securities |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 3 | U.S. Government obligations |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 3 | Asset-backed securities |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 3 | Non-U.S. government obligations |  |
Financial Assets: |  |
Fixed maturities | 0.0 | 0.0
Level 3 | Warrant liability |  |
Financial Assets: |  |
Warrant liability | $ 0.0 | $ 0.0

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