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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Line Items] |  |
United States corporate tax at a rate | 21.00% |
Increase (decrease) in valuation allowance | $ 38.8 | $ 37.9
Less valuation allowance | 225.9 | 187.1
Deferred Tax Liabilities, Net | 2.8 | 5.2
Deferred Tax Assets, Gross | 277.5 | 240.7
Lloyd's | U.K. |  |
Income Taxes [Line Items] |  |
Deferred tax losses, operating loss carryforward | 66.2 | 57.9
Other juridictions | U.K. |  |
Income Taxes [Line Items] |  |
Deferred tax losses, operating loss carryforward | 103.9 | 46.8
U.K. operating companies |  |
Income Taxes [Line Items] |  |
Deferred tax liabilities and assets |  | 48.1
Swiss branches of the UK operating companies |  |
Income Taxes [Line Items] |  |
Deferred Tax Liabilities, Net |  | 5.4
Other Comprehensive Income | U.K. |  |
Income Taxes [Line Items] |  |
Less valuation allowance | 27.5 | 4.8
Internal Revenue Service (IRS) |  |
Income Taxes [Line Items] |  |
Net operating loss carryforwards | 443.1 | 526.4
Operating loss carryforwards, remaining | 443.1 |
Operating loss carryforwards, subject to expiration date | 443.1 |
Charitable contribution carryforwards | 0.1 | 1.0
Less valuation allowance | 119.7 | 119.2
Internal Revenue Service (IRS) | Aspen U.K. |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, subject to s382 limitation | 6.5 |
Internal Revenue Service (IRS) | U.S. operating subsidiaries |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, subject to s382 limitation | $ 20.8 |
Internal Revenue Service (IRS) | Minimum |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, date of expiration | 2031 |
Internal Revenue Service (IRS) | Maximum |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, date of expiration | 2039 |
U.K. |  |
Income Taxes [Line Items] |  |
U. K. corporate tax rate | 19.00% |
Net operating loss carryforwards | $ 168.9 | 101.8
Operating loss carryforwards, remaining | 20.2 | 16.7
Capital loss carryforwards | 3.8 |
Less valuation allowance | $ 88.7 | 58.6
Bermuda |  |
Income Taxes [Line Items] |  |
Bermuda tax rate | 0.00% |
Valuation Allowance, Operating Loss Carryforwards | U.K. |  |
Income Taxes [Line Items] |  |
Less valuation allowance | $ 9.6 | 40.8
Foreign Exchange | U.K. |  |
Income Taxes [Line Items] |  |
Less valuation allowance | $ 1.7 | $ 1.9

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