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v3.23.4

Commitments and Contingencies - Additional Information (Details) £ in Millions, SFr in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2023 GBP (£) | Jun. 30, 2023 CAD ($) | Jun. 30, 2023 AUD ($) | Jun. 30, 2023 CHF (SFr) | Jun. 30, 2023 SGD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2022 CAD ($) | Dec. 31, 2022 AUD ($) | Dec. 31, 2022 CHF (SFr) | Dec. 31, 2022 SGD ($) | Apr. 01, 2022 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 CAD ($) | Dec. 31, 2021 AUD ($) | Dec. 31, 2021 CHF (SFr) | Dec. 31, 2021 SGD ($) | Sep. 30, 2021 USD ($) | Dec. 23, 2019 USD ($) | Dec. 20, 2017 USD ($)
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  | $ 266.5 | $ 471.3 | $ 539.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments (equity method) |  | $ 213.4 | $ 221.3 | $ 151.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total as percent of investable assets |  | 52.60% | 59.40% | 59.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in the period |  | $ 0.4 | $ 2.0 | $ 3.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investable assets held by the Company |  | 7,400.0 | 7,100.0 | 7,800.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investable assets held by insurance regulators |  | $ 551.0 | $ 489.5 | 565.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum capital required | £ |  |  |  |  | £ 0.4 |  |  |  |  | £ 0.4 |  |  |  |  |  | £ 0.4 |  |  |  |  |  |  |
Percentage of reinsurance liabilities |  | 100.00% | 100.00% |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Reinsurance liabilities |  | $ 1,009.3 | $ 1,166.4 | 1,470.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 1,167.8 | 1,389.5 | 1,581.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory deposits |  | 10.3 | 6.7 | 6.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deposit with states |  | 6.7 | 6.5 | 6.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
MVI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in the period | $ 0.8 | 0.0 | 0.4 | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Multi-Line Insurer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other investments (equity method) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 |
Investment in the period |  | 0.4 | 1.6 | 2.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Us Multi Beneficiary Trust Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum trust fund |  | 20.0 | 20.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 383.2 | 509.2 | 519.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Us Surplus Lines Trust Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 141.0 | 215.1 | 216.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Canadian Trust Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 151.8 | 137.2 |  |  | $ 200.9 |  |  |  |  | $ 185.8 |  |  |  |  |  | $ 196.8 |  |  |  |  |  |
Australian Trust Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 102.0 | 124.7 |  |  |  | $ 153.2 |  |  |  |  | $ 183.9 |  |  |  |  |  | $ 226.6 |  |  |  |  |
Swiss Trust Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | 10.6 | 10.2 |  |  |  |  | SFr 9.5 |  |  |  |  | SFr 9.4 |  |  |  |  |  | SFr 8.0 |  |  |  |
Singapore Trust Fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets held-in-trust |  | $ 127.5 | $ 130.3 |  |  |  |  |  | $ 172.6 |  |  |  |  | $ 174.7 |  |  |  |  |  | $ 178.0 |  |  |
Bermuda |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of reinsurance liabilities |  | 100.00% | 100.00% |  | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |  |  |  |  |
Reinsurance liabilities |  | $ 306.7 | $ 380.3 | 450.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited Partner | Real estate fund |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Cash And Collateral [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.0 |  |  |  |  |  | $ 20.0 |  | $ 100.0
Other investments (equity method) |  | $ 213.4 | $ 221.3 | $ 151.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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