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Fair Value Measurement - Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash, cash equivalents, and restricted cash | $ 220.2 | $ 195.1 | $ 238.4 | $ 244.5
Fixed maturities available-for-sale | 167.0 | 161.7 |  |
Short-term investments | 148.5 | 187.1 |  |
Total financial assets | 535.7 | 543.9 |  |
Financial liabilities: |  |  |  |
Contingent consideration liability | 13.8 | 13.6 |  |
Total financial liabilities | 14.0 | 13.8 |  |
Public warrants |  |  |  |
Financial liabilities: |  |  |  |
Warrants liabilities | 0.1 | 0.1 |  |
Private placement warrants |  |  |  |
Financial liabilities: |  |  |  |
Warrants liabilities | 0.1 | 0.1 |  |
U.S. government and agencies |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 17.4 | 18.4 |  |
Short-term investments | 103.8 | 137.7 |  |
States and other territories |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 8.0 | 8.9 |  |
Corporate securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 99.8 | 91.1 |  |
Short-term investments | 25.3 | 14.9 |  |
Foreign securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.9 | 0.9 |  |
Residential mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 18.1 | 19.5 |  |
Commercial mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 7.2 | 7.1 |  |
Asset backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 15.6 | 15.8 |  |
Commercial paper |  |  |  |
Financial assets: |  |  |  |
Short-term investments | 19.4 | 34.5 |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Cash, cash equivalents, and restricted cash | 220.2 | 195.1 |  |
Fixed maturities available-for-sale | 17.4 | 18.4 |  |
Short-term investments | 103.8 | 137.7 |  |
Total financial assets | 341.4 | 351.2 |  |
Financial liabilities: |  |  |  |
Contingent consideration liability | 0.0 | 0.0 |  |
Total financial liabilities | 0.1 | 0.1 |  |
Level 1 | Public warrants |  |  |  |
Financial liabilities: |  |  |  |
Warrants liabilities | 0.1 | 0.1 |  |
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 | 17.4 | 18.4 |  |
Short-term investments | 103.8 | 137.7 |  |
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 | 149.6 | 143.3 |  |
Short-term investments | 44.7 | 49.4 |  |
Total financial assets | 194.3 | 192.7 |  |
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 | 8.0 | 8.9 |  |
Level 2 | Corporate securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 99.8 | 91.1 |  |
Short-term investments | 25.3 | 14.9 |  |
Level 2 | Foreign securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 0.9 | 0.9 |  |
Level 2 | Residential mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 18.1 | 19.5 |  |
Level 2 | Commercial mortgage-backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 7.2 | 7.1 |  |
Level 2 | Asset backed securities |  |  |  |
Financial assets: |  |  |  |
Fixed maturities available-for-sale | 15.6 | 15.8 |  |
Level 2 | Commercial paper |  |  |  |
Financial assets: |  |  |  |
Short-term investments | 19.4 | 34.5 |  |
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 | 13.8 | 13.6 |  |
Total financial liabilities | 13.8 | 13.6 |  |
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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