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Reserves for Losses and Adjustment Expenses - Additional Information (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
Insurance [Abstract] |  |  |  |  |
Provision for losses and LAE for claims incurred | $ (6.4) | $ (7.3) | $ 28.1 | $ 45.1 | $ (0.9)
Prior years | (6.4) | (7.3) | 28.1 | 45.1 | (0.9)
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |  |  |
Prior years | (6.4) | $ (7.3) | 28.1 | $ 45.1 | $ (0.9)
Reinsurance |  |  |  |  |
Insurance [Abstract] |  |  |  |  |
Provision for losses and LAE for claims incurred | (2.1) |  |  |  |
Prior years | (2.1) |  |  |  |
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |  |  |
Prior years | (2.1) |  |  |  |
Insurance |  |  |  |  |
Insurance [Abstract] |  |  |  |  |
Provision for losses and LAE for claims incurred | 8.5 |  | 86.9 |  |
Prior years | 8.5 |  | 86.9 |  |
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |  |  |
Prior years | 8.5 |  | $ 86.9 |  |
Insurance | Reinsurance Contracts [Axis]: LPT, deferred gain |  |  |  |  |
Insurance [Abstract] |  |  |  |  |
Provision for losses and LAE for claims incurred | 13.2 |  |  |  |
Prior years | 13.2 |  |  |  |
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |  |  |
Prior years | 13.2 |  |  |  |
Insurance | Reinsurance Contracts [Axis]: LPT, offset post-LPT years |  |  |  |  |
Insurance [Abstract] |  |  |  |  |
Provision for losses and LAE for claims incurred | 4.7 |  |  |  |
Prior years | 4.7 |  |  |  |
Financial Guarantee Insurance Contracts, Premium Received over Contract Period [Line Items] |  |  |  |  |
Prior years | $ 4.7 |  |  |  |

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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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