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Geographical Breakdown of Gross Written Premium (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Gross Written Premium [Line Items]
Amount	$ 210.9	$ 194.7
Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	100.00%	100.00%
California
Gross Written Premium [Line Items]
Amount	$ 45.9	$ 40.5
California | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	21.80%	20.80%
Texas
Gross Written Premium [Line Items]
Amount	$ 25.9	$ 27.7
Texas | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	12.30%	14.20%
Florida
Gross Written Premium [Line Items]
Amount	$ 31.9	$ 25.6
Florida | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	15.10%	13.10%
Illinois
Gross Written Premium [Line Items]
Amount	$ 5.9	$ 7.3
Illinois | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	2.80%	3.70%
Georgia
Gross Written Premium [Line Items]
Amount	$ 5.6	$ 6.0
Georgia | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	2.70%	3.00%
South Carolina
Gross Written Premium [Line Items]
Amount	$ 4.5	$ 4.4
South Carolina | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	2.10%	2.20%
New York
Gross Written Premium [Line Items]
Amount	$ 12.1	$ 5.7
New York | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	5.70%	2.90%
Colorado
Gross Written Premium [Line Items]
Amount	$ 4.4	$ 4.1
Colorado | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	2.10%	2.00%
New Jersey
Gross Written Premium [Line Items]
Amount	$ 4.2	$ 4.0
New Jersey | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	2.00%	2.00%
Ohio
Gross Written Premium [Line Items]
Amount	$ 4.6	$ 3.0
Ohio | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	2.20%	1.50%
Other
Gross Written Premium [Line Items]
Amount	$ 65.9	$ 67.3
Other | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage (as a percent)	31.20%	34.60%

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Gross Written Premium

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No definition available.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of direct and assumed premiums written.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 605
-Topic 944
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