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Concentration of Credit Risk - Additional Information (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Concentration Risk [Line Items]
Less foreign exchange (gains)/losses	$ 4,658.0	$ 4,897.7	$ 5,006.5
Reinsurance Recoverables, Collateralized	0.560	0.579
Underwriting premiums receivables (net of allowance for expected credit losses of 2023: $21.6 — 2022: $25.0)	$ 1,676.8	$ 1,482.4
Due for settlement	5.9
Premium Receivable, Allowance for Credit Loss	$ 21.6	25.0	$ 25.0
Allowable holdings of a single issue or issuer, percentage	2.00%
Reinsurance Recoverable, Allowance for Credit Loss	$ 3.3	$ 3.7
Munich Re
Concentration Risk [Line Items]
Concentration risk	0.092	0.097
Everest Re
Concentration Risk [Line Items]
Concentration risk	0.160	0.163
Lloyd's
Concentration Risk [Line Items]
Concentration risk	0.078	0.082
AA- or higher
Concentration Risk [Line Items]
Reinsurance Recoverables, Collateralized	0.435	0.420
AA- or lower
Concentration Risk [Line Items]
Reinsurance Recoverables, Collateralized	0.005	0.001

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Value represents the Concentration Risk

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Reinsurance Recoverables, Collateralized, percent

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The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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The carrying amount as of the balance sheet date due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, net of the allowance for doubtful accounts.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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