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Concentration of Credit Risk - Schedule Of Gross Written Premium From Major Brokers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Gross written premiums, percentage	100.00%	100.00%	100.00%
Gross written premiums	$ 4,338.7	$ 3,938.4	$ 3,698.5
Percentage of written premium major broker accounted minimum	10.00%
Aon Corporation
Investment Holdings [Line Items]
Gross written premiums, percentage	22.30%	17.30%	15.80%
Marsh & McLennan Companies, Inc.
Investment Holdings [Line Items]
Gross written premiums, percentage	21.80%	17.50%	15.40%
Willis Group Holdings, Ltd.
Investment Holdings [Line Items]
Gross written premiums, percentage	8.00%	9.60%	10.40%
Others
Investment Holdings [Line Items]
Gross written premiums, percentage	47.90%	55.60%	58.40%

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Percentage of written premium major broker accounted minimum.

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Premiums written gross percentage.

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Amount of direct and assumed premiums written.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 605
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547

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