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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | 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) |  | $ 36.2 | $ 4.7 | (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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- Definition Amount of reported income tax expense from difference to expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to base erosion and anti-abuse tax (BEAT). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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