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Fair Value Measurement - Fair Value, Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Financial assets: |  |  |
Cash, cash equivalents, and restricted cash | $ 195.1 | $ 244.5 | $ 818.7
Fixed maturities available-for-sale | 161.7 | 121.1 |
Short-term investments | 187.1 | 324.8 |
Total financial assets | 543.9 | 690.4 |
Financial liabilities: |  |  |
Contingent consideration liability | 13.6 | 11.9 |
Total financial liabilities | 13.8 | 12.2 |
Public warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.1 | 0.2 |
Private placement warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.1 | 0.1 |
U.S. government and agencies |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 18.4 | 21.1 |
Short-term investments | 137.7 | 128.9 |
States and other territories |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 8.9 | 8.3 |
Corporate securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 91.1 | 52.5 |
Short-term investments | 14.9 | 49.4 |
Foreign securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 0.9 | 0.8 |
Residential mortgage-backed securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 19.5 | 18.9 |
Commercial mortgage-backed securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 7.1 | 5.8 |
Asset backed securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 15.8 | 13.7 |
Commercial paper |  |  |
Financial assets: |  |  |
Short-term investments | 34.5 | 146.5 |
Level 1 |  |  |
Financial assets: |  |  |
Cash, cash equivalents, and restricted cash | 195.1 | 244.5 |
Fixed maturities available-for-sale | 18.4 | 21.1 |
Short-term investments | 137.7 | 128.9 |
Total financial assets | 351.2 | 394.5 |
Financial liabilities: |  |  |
Contingent consideration liability | 0.0 | 0.0 |
Total financial liabilities | 0.1 | 0.2 |
Level 1 | Public warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.1 | 0.2 |
Level 1 | Private placement warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.0 | 0.0 |
Level 1 | U.S. government and agencies |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 18.4 | 21.1 |
Short-term investments | 137.7 | 128.9 |
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 | 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 | 143.3 | 100.0 |
Short-term investments | 49.4 | 195.9 |
Total financial assets | 192.7 | 295.9 |
Financial liabilities: |  |  |
Contingent consideration liability | 0.0 | 0.0 |
Total financial liabilities | 0.1 | 0.1 |
Level 2 | Public warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.0 | 0.0 |
Level 2 | Private placement warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.1 | 0.1 |
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 | 8.9 | 8.3 |
Level 2 | Corporate securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 91.1 | 52.5 |
Short-term investments | 14.9 | 49.4 |
Level 2 | Foreign securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 0.9 | 0.8 |
Level 2 | Residential mortgage-backed securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 19.5 | 18.9 |
Level 2 | Commercial mortgage-backed securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 7.1 | 5.8 |
Level 2 | Asset backed securities |  |  |
Financial assets: |  |  |
Fixed maturities available-for-sale | 15.8 | 13.7 |
Level 2 | Commercial paper |  |  |
Financial assets: |  |  |
Short-term investments | 34.5 | 146.5 |
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 | 13.6 | 11.9 |
Total financial liabilities | 13.6 | 11.9 |
Level 3 | Public warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.0 | 0.0 |
Level 3 | Private placement warrants |  |  |
Financial liabilities: |  |  |
Warrants liabilities | 0.0 | 0.0 |
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 | 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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