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Income Taxes - Income/(Loss) Before Tax and Income Tax Expense/(Benefit) Attributable to that Income (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Examination [Line Items] |  |  |  |  |
(Loss) before tax, Non-U.S. |  |  | $ (20.9) | $ (67.9) | $ 12.8
(Loss) before tax, U.S. |  |  | 34.8 | 5.0 | 19.7
Income (loss) from operations before income taxes | $ 255.1 | $ 53.1 | (27.0) | 35.1 | (38.0)
Current tax (benefit)/expense, Non-U.S. |  |  | 4.7 | 2.7 | 10.3
Current tax (benefit)/expense, U.S. |  |  | 14.8 | 5.8 | 8.9
Current tax (benefit)/expense, Total |  |  | 26.5 | 8.5 | 19.3
Deferred tax (benefit), Non-U.S. |  |  | (1.7) | (2.9) | (0.9)
Deferred tax (benefit), U.S. |  |  | (102.9) | 0.0 | 0.0
Deferred tax, Total |  |  | (104.6) | (3.2) | (0.9)
Total tax expense/(benefit), Non-U.S. |  |  | 3.0 | (0.2) | 9.4
Total tax expense/(benefit), U.S. |  |  | (88.1) | 5.8 | 8.9
Total tax expense/(benefit) | $ 36.2 | $ 4.7 | (78.1) | 5.3 | 18.4
Current tax expenses (benefit) related to prior year |  |  | 14.8 |  |
Base erosion and anti-abuse (BEAT) expense |  |  | 2.3 | 6.1 | 4.3
U.S. operating subsidiaries |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Base erosion and anti-abuse (BEAT) expense |  |  | 1.1 |  |
Aspen U.K. |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Base erosion and anti-abuse (BEAT) expense |  |  | 1.2 |  |
Bermuda |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
(Loss) before tax, Non-U.S. |  |  | (103.3) | 22.9 | (81.5)
Current tax (benefit)/expense, Non-U.S. |  |  | 0.0 | 0.0 | 0.0
Deferred tax (benefit), Non-U.S. |  |  | 0.0 | 0.0 | 0.0
Total tax expense/(benefit), Non-U.S. |  |  | 0.0 | 0.0 | 0.0
U.K. |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
(Loss) before tax, Non-U.S. |  |  | 62.4 | 75.1 | 11.0
Current tax (benefit)/expense, Non-U.S. |  |  | 7.0 | 0.0 | 0.1
Deferred tax (benefit), Non-U.S. |  |  | 0.0 | (0.3) | 0.0
Total tax expense/(benefit), Non-U.S. |  |  | $ 7.0 | $ (0.3) | $ 0.1

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