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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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- Definition The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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