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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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