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Geographical Breakdown of Gross Written Premium (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Gross Written Premium [Line Items]
Amount	$ 847.3	$ 629.9
Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	100.00%	100.00%
Texas
Gross Written Premium [Line Items]
Amount	$ 151.6	$ 155.6
Texas | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	17.90%	24.70%
California
Gross Written Premium [Line Items]
Amount	$ 156.7	$ 116.3
California | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	18.50%	18.50%
Florida
Gross Written Premium [Line Items]
Amount	$ 111.5	$ 55.4
Florida | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	13.20%	8.80%
Georgia
Gross Written Premium [Line Items]
Amount	$ 37.7	$ 29.3
Georgia | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	4.40%	4.70%
Illinois
Gross Written Premium [Line Items]
Amount	$ 25.9	$ 22.7
Illinois | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	3.10%	3.60%
Colorado
Gross Written Premium [Line Items]
Amount	$ 23.4	$ 19.3
Colorado | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	2.80%	3.10%
Missouri
Gross Written Premium [Line Items]
Amount	$ 15.8	$ 15.0
Missouri | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	1.90%	2.40%
Arizona
Gross Written Premium [Line Items]
Amount	$ 18.3	$ 14.3
Arizona | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	2.20%	2.30%
Ohio
Gross Written Premium [Line Items]
Amount	$ 15.2	$ 13.8
Ohio | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	1.80%	2.20%
New Jersey
Gross Written Premium [Line Items]
Amount	$ 17.2	$ 14.0
New Jersey | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	2.00%	2.20%
Other
Gross Written Premium [Line Items]
Amount	$ 274.0	$ 174.2
Other | Geographic Concentration Risk | Gross written premium
Gross Written Premium [Line Items]
Concentration risk, percentage	32.30%	27.70%

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Gross Written Premium

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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
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-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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