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Concentration of Credit Risk - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Concentration Risk [Line Items]
Less foreign exchange (gains)/losses	$ 4,897.7	$ 3,298.1	$ 3,195.2
Reinsurance Recoverables, Uncollateralized	2,092.4	1,981.4
Underwriting premiums receivables (net of allowance for expected credit losses of 2022: $25.0 — 2021: $30.2)	1,482.4	1,304.6
Due for settlement	18.3
Premium Receivable, Allowance for Credit Loss	$ 25.0	30.2
Allowable holdings of a single issue or issuer, percentage	2.00%
Percentage of written premium major broker accounted minimum	10.00%
Reinsurance Recoverable, Allowance for Credit Loss	$ 3.7	$ 3.3	$ 3.8
AM Best, A plus Rating | Standard & Poor's, A plus Rating | Everest Re
Concentration Risk [Line Items]
Concentration risk	0.163	0.159
AM Best, A plus Rating | Standard & Poor's, AA- Rating | Munich Re
Concentration Risk [Line Items]
Concentration risk	0.097	0.108
AM Best, A Rating | Standard & Poor's, A plus Rating | Lloyd's
Concentration Risk [Line Items]
Concentration risk	0.082	0.093

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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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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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