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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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