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v3.24.1

Segment Reporting - Summary of Gross and Net Written and Earned Premiums, Underwriting Results, Ratios and Reserves for Each of Company's Business Segments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 3,967.6 | $ 4,338.7 | $ 3,938.4 |
Net written premiums | 2,581.9 | 2,896.0 | 2,587.7 |
Gross earned premiums | 4,006.8 | 3,988.0 | 3,618.3 |
Net earned premiums | 2,614.5 | 2,688.7 | 2,410.5 |
Losses and loss adjustment expenses | 1,553.0 | 1,680.0 | 1,693.3 |
Acquisition costs | 380.2 | 431.8 | 414.1 |
General and administrative expenses | 354.5 | 386.5 | 333.1 |
Underwriting income (loss) | 326.8 | 190.4 | (30.0) |
Corporate Expenses | (114.0) | (71.7) | (64.3) |
Non-operating expenses (1) | (35.1) | (36.0) | (20.6) |
Net investment income (1) | 275.7 | 188.1 | 147.5 |
Realized and unrealized investment gains | 75.9 | 5.0 | 56.2 |
Realized and unrealized investment losses | (61.4) | (182.6) | (47.4) |
Change in fair value of derivatives | 26.1 | (80.5) | (35.9) |
Interest Expense, Debt | (55.2) | (43.7) | (14.3) |
Net realized and unrealized foreign exchange gains | (36.2) | 15.9 | 40.0 |
Other income | 0.0 | 8.2 | 14.7 |
Other expenses | 0.0 | 20.1 | 10.8 |
Income (loss) from operations before income taxes | 402.6 | (27.0) | 35.1 |
Income Tax Expense (Benefit) | 132.1 | 78.1 | (5.3) |
Net income/(loss) | 534.7 | 51.1 | 29.8 |
Losses and loss adjustment expenses | 7,810.6 | 7,710.9 | 7,611.8 | $ 7,165.3
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total | $ 3,232.8 | $ 2,813.2 | $ 4,313.7 | $ 3,970.1
Ratios |  |  |  |
Loss ratio | 59.40% | 62.50% | 70.20% |
Acquisition cost ratio | 14.50% | 16.10% | 17.20% |
General and administrative expense ratio | 13.60% | 14.40% | 13.80% |
Expense ratio | 28.10% | 30.50% | 31.00% |
Combined ratio | 87.50% | 93.00% | 101.20% |
Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net written premiums | $ 1,098.0 | $ 1,426.4 | $ 1,199.0 |
Net earned premiums | 1,154.5 | 1,251.8 | 1,118.8 |
Losses and loss adjustment expenses | 1,373.1 | 1,360.7 | 2,148.4 |
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total | $ 1,373.1 | $ 1,360.7 | $ 2,148.4 |
Ratios |  |  |  |
Loss ratio | 52.90% | 61.50% | 63.00% |
Acquisition cost ratio | 18.10% | 20.20% | 19.80% |
General and administrative expense ratio | 10.40% | 11.40% | 10.80% |
Expense ratio | 28.50% | 31.60% | 30.60% |
Combined ratio | 81.40% | 93.10% | 93.60% |
Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net written premiums | $ 1,483.9 | $ 1,469.6 | $ 1,388.7 |
Net earned premiums | 1,460.0 | 1,436.9 | 1,291.7 |
Losses and loss adjustment expenses | 1,859.7 | 1,452.5 | 2,165.3 |
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total | $ 1,859.7 | $ 1,452.5 | $ 2,165.3 |
Ratios |  |  |  |
Loss ratio | 64.50% | 63.30% | 76.50% |
Acquisition cost ratio | 11.80% | 12.50% | 14.90% |
General and administrative expense ratio | 16.00% | 17.00% | 16.40% |
Expense ratio | 27.80% | 29.50% | 31.30% |
Combined ratio | 92.30% | 92.80% | 107.80% |
Operating Segments | Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 1,521.0 | $ 1,807.0 | $ 1,597.0 |
Net written premiums | 1,098.0 | 1,426.4 | 1,199.0 |
Gross earned premiums | 1,562.0 | 1,617.2 | 1,479.2 |
Net earned premiums | 1,154.5 | 1,251.8 | 1,118.8 |
Losses and loss adjustment expenses | 611.1 | 770.3 | 705.2 |
Acquisition costs | 208.6 | 252.4 | 221.6 |
General and administrative expenses | 120.6 | 142.5 | 121.3 |
Underwriting income (loss) | 214.2 | 86.6 | 70.7 |
Operating Segments | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 2,446.6 | 2,531.7 | 2,341.4 |
Net written premiums | 1,483.9 | 1,469.6 | 1,388.7 |
Gross earned premiums | 2,444.8 | 2,370.8 | 2,139.1 |
Net earned premiums | 1,460.0 | 1,436.9 | 1,291.7 |
Losses and loss adjustment expenses | 941.9 | 909.7 | 988.1 |
Acquisition costs | 171.6 | 179.4 | 192.5 |
General and administrative expenses | 233.9 | 244.0 | 211.8 |
Underwriting income (loss) | $ 112.6 | $ 103.8 | $ (100.7) |

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