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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Income Taxes [Line Items] |  |
United States corporate tax at a rate | 21.00% |
Capital loss carryforwards | $ 6.7 | $ 0.3
Less valuation allowance | 145.7 | 225.9
Deferred Tax Liabilities, Net |  | 2.8
Deferred Tax Assets, Gross | 322.2 | 277.5
Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Capital loss carryforwards | 31.7 |
Aspen U.K. | Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Capital loss carryforwards | 16.7 |
U.S. operating subsidiaries | Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Capital loss carryforwards | 15.0 |
Lloyd's | U.K. |  |
Income Taxes [Line Items] |  |
Deferred tax losses, operating loss carryforward | (19.9) | (66.2)
Other juridictions | U.K. |  |
Income Taxes [Line Items] |  |
Deferred tax losses, operating loss carryforward | (118.8) | (103.9)
Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 376.5 | 443.1
Operating loss carryforwards, remaining | 376.5 |
Charitable contribution carryforwards | 0.0 | 0.1
Less valuation allowance | 18.0 | 119.7
Internal Revenue Service (IRS) | Aspen U.K. |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 67.1 |
Operating loss carryforwards, subject to s382 limitation | 6.5 |
Internal Revenue Service (IRS) | U.S. operating subsidiaries |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 309.4 |
Operating loss carryforwards, subject to s382 limitation | $ 20.8 |
Internal Revenue Service (IRS) | Minimum |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, date of expiration | 2032 |
Internal Revenue Service (IRS) | Maximum |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, date of expiration | 2041 |
U.K. |  |
Income Taxes [Line Items] |  |
U. K. corporate tax rate | 19.00% |
Net operating loss carryforwards | $ 280.5 | 168.9
Operating loss carryforwards, remaining | 19.8 | 20.2
Less valuation allowance | $ 106.7 | $ 88.7
Bermuda |  |
Income Taxes [Line Items] |  |
Bermuda tax rate | 0.00% |

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