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v3.23.1

Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |
Income tax benefit at statutory tax rate of zero percent |  | $ 0.0 | $ 0.0 | $ 0.0
Overseas statutory tax rates differential |  | 16.8 | (0.9) | (3.8)
Base erosion and anti-abuse (BEAT) expense |  | 2.3 | 6.1 | 4.3
Prior year adjustments |  | (2.9) | 0.5 | (25.0)
Change in valuation allowance (2) |  | (98.9) | 9.6 | 40.8
Impact of unrecognized tax benefits |  | 0.0 | 0.0 | 0.0
Australian non-resident withholding tax |  | 1.5 | 0.6 | 1.0
Foreign exchange |  | (0.3) | (1.5) | 0.2
Non-deductible expenses |  | 2.4 | 2.4 | 4.7
Impact of changes in statutory tax rates (4) |  | (5.7) | (11.5) | (3.8)
Effective Income Tax Rate Reconciliation, Tax Effect of OCI, Amount |  | 6.7 | 0.0 | 0.0
Total tax expense/(benefit) |  | (78.1) | $ 5.3 | $ 18.4
U.S. operating subsidiaries |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Base erosion and anti-abuse (BEAT) expense |  | 1.1 |  |
Aspen U.K. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Base erosion and anti-abuse (BEAT) expense |  | $ 1.2 |  |
U.K. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
U. K. corporate tax rate |  | 19.00% |  |
U.K. | Forecast |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
U. K. corporate tax rate | 25.00% |  |  |
Lloyd's syndicate |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Valuation allowance, associated losses |  | $ 0.0 |  |

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