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Reserves for Losses and Adjustment Expenses Short-duration insurance contracts - Reconciliation of Claims Development (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | $ 3,151.6 |  | $ 4,484.0 |  |
Reinsurance recoverable on unpaid losses |  | 4,897.7 |  | 3,298.1 |  |
Unallocated claims incurred |  | 41.4 |  | 56.6 |  |
Carbon syndicate reserves |  | 5.2 |  | 1.0 |  |
Other |  | 1.6 |  | 0.2 |  |
Liability for unpaid claims and claim adjustment expense, aggregate reconciling items |  | (338.4) |  | (170.3) |  |
Losses and loss adjustment expenses | $ 7,740.9 | 7,710.9 | $ 7,511.8 | 7,611.8 | $ 7,165.3 | $ 6,951.8
Property Insurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 259.0 |  | 289.3 |  |
Casualty Insurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 457.3 |  | 725.6 |  |
Marine, Aviation and Energy Insurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 163.7 |  | 427.9 |  |
Financial and Professional Insurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 671.9 |  | 808.7 |  |
Insurance lines |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 1,551.9 |  | 2,251.5 |  |
Reinsurance recoverable on unpaid losses |  | 2,907.8 |  | 2,117.4 |  |
Property Catastrophe and Other Property Reinsurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 677.9 |  | 784.9 |  |
Casualty Reinsurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 571.6 |  | 975.3 |  |
Specialty Reinsurance |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 350.2 |  | 472.3 |  |
Reinsurance lines |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Liability for claims and claim adjustment expenses, net of reinsurance |  | 1,599.7 |  | 2,232.5 |  |
Reinsurance recoverable on unpaid losses |  | 1,989.9 |  | 1,180.7 |  |
Insurance lines other than short-duration |  |  |  |  |  |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |  |  |  |  |  |
Other reinsurance balances recoverable |  | (429.3) |  | (286.4) |  |
Losses and loss adjustment expenses |  | $ 42.7 |  | $ 58.3 |  |

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- Definition Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Other Reconciling Item, Other Reinsurance Balances Recoverable + References No definition available. + Details
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