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v3.25.1

Fair Value Measurement - Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash, cash equivalents, and restricted cash | $ 180.2 | $ 232.8 | $ 263.3 | $ 195.1
Fixed maturities available-for-sale | 212.2 | 205.7 |  |
Short-term investments | 175.4 | 167.6 |  |
Total financial assets | 567.8 | 606.1 |  |
Financial liabilities: |  |  |  |
Contingent consideration liability | 10.8 | 11.7 |  |
Total financial liabilities | 10.8 | 11.7 |  |
U.S. government and agencies |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 29.3 | 24.6 |  |
Short-term investments | 129.2 | 118.5 |  |
States and other territories |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 10.3 | 10.9 |  |
Corporate securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 136.5 | 131.5 |  |
Short-term investments | 37.8 | 31.6 |  |
Foreign securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale |  | 0.0 |  |
Residential mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 19.8 | 20.0 |  |
Commercial mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 6.8 | 6.9 |  |
Asset backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 9.5 | 11.8 |  |
Commercial paper |  |  |  |
Financial assets: |  |  |  |
Short-term investments | 8.4 | 17.5 |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Cash, cash equivalents, and restricted cash | 180.2 | 232.8 |  |
Fixed maturities available-for-sale | 29.3 | 24.6 |  |
Short-term investments | 129.2 | 118.5 |  |
Total financial assets | 338.7 | 375.9 |  |
Financial liabilities: |  |  |  |
Contingent consideration liability | 0.0 | 0.0 |  |
Total financial liabilities | 0.0 | 0.0 |  |
Level 1 | U.S. government and agencies |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 29.3 | 24.6 |  |
Short-term investments | 129.2 | 118.5 |  |
Level 1 | States and other territories |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 1 | Corporate securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Short-term investments | 0.0 | 0.0 |  |
Level 1 | Foreign securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale |  | 0.0 |  |
Level 1 | Residential mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 1 | Commercial mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 1 | Asset backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 1 | Commercial paper |  |  |  |
Financial assets: |  |  |  |
Short-term investments | 0.0 | 0.0 |  |
Level 2 |  |  |  |
Financial assets: |  |  |  |
Cash, cash equivalents, and restricted cash | 0.0 | 0.0 |  |
Fixed maturities available-for-sale | 182.9 | 181.1 |  |
Short-term investments | 46.2 | 49.1 |  |
Total financial assets | 229.1 | 230.2 |  |
Financial liabilities: |  |  |  |
Contingent consideration liability | 0.0 | 0.0 |  |
Total financial liabilities | 0.0 | 0.0 |  |
Level 2 | U.S. government and agencies |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Short-term investments | 0.0 | 0.0 |  |
Level 2 | States and other territories |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 10.3 | 10.9 |  |
Level 2 | Corporate securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 136.5 | 131.5 |  |
Short-term investments | 37.8 | 31.6 |  |
Level 2 | Foreign securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale |  | 0.0 |  |
Level 2 | Residential mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 19.8 | 20.0 |  |
Level 2 | Commercial mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 6.8 | 6.9 |  |
Level 2 | Asset backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 9.5 | 11.8 |  |
Level 2 | Commercial paper |  |  |  |
Financial assets: |  |  |  |
Short-term investments | 8.4 | 17.5 |  |
Level 3 |  |  |  |
Financial assets: |  |  |  |
Cash, cash equivalents, and restricted cash | 0.0 | 0.0 |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Short-term investments | 0.0 | 0.0 |  |
Total financial assets | 0.0 | 0.0 |  |
Financial liabilities: |  |  |  |
Contingent consideration liability | 10.8 | 11.7 |  |
Total financial liabilities | 10.8 | 11.7 |  |
Level 3 | U.S. government and agencies |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Short-term investments | 0.0 | 0.0 |  |
Level 3 | States and other territories |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 3 | Corporate securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Short-term investments | 0.0 | 0.0 |  |
Level 3 | Foreign securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale |  | 0.0 |  |
Level 3 | Residential mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 3 | Commercial mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 3 | Asset backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.0 | 0.0 |  |
Level 3 | Commercial paper |  |  |  |
Financial assets: |  |  |  |
Short-term investments | $ 0.0 | $ 0.0 |  |

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