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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