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v3.25.1

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, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 4,609.3 | $ 3,967.6 | $ 4,338.7 |
Net written premiums | 2,942.6 | 2,581.9 | 2,896.0 |
Gross earned premiums | 4,387.8 | 4,006.8 | 3,988.0 |
Net earned premiums | 2,889.7 | 2,614.5 | 2,688.7 |
Losses and loss adjustment expenses | 1,717.8 | 1,553.0 | 1,680.0 |
Acquisition costs | 420.2 | 380.2 | 431.8 |
General and administrative expenses | 405.9 | 354.5 | 386.5 |
Underwriting income (loss) | 345.8 | 326.8 | 190.4 |
Corporate and other expenses | (97.3) | (114.0) | (71.7) |
Non-operating expenses (2) | (29.9) | (35.1) | (36.0) |
Net investment income (1) | 318.0 | 275.7 | 188.1 |
Gain (loss) on investments | 52.6 | 75.9 | 5.0 |
Realized and unrealized investment losses | (102.1) | (61.4) | (182.6) |
Change in fair value of derivatives | (21.1) | 26.1 | (80.5) |
Interest Expense, Debt | (62.1) | (55.2) | (43.7) |
Net realized and unrealized foreign exchange gains | 60.2 | (36.2) | 15.9 |
Other income | 0.0 | 0.0 | 8.2 |
Other expenses | 0.0 | 0.0 | 20.1 |
Income (loss) from operations before income taxes | 464.1 | 402.6 | (27.0) |
Income Tax Expense (Benefit) | 22.0 | 132.1 | 78.1 |
Net income/(loss) | 486.1 | 534.7 | 51.1 |
Reserve for losses and loss adjustment expenses | 8,122.6 | 7,810.6 | 7,710.9 | $ 7,611.8
Net reserve for losses and LAE at the start of the year | $ 3,950.6 | $ 3,232.8 | $ 2,813.2 | $ 4,313.7
Ratios |  |  |  |
Loss ratio | 59.40% | 59.40% | 62.50% |
Acquisition cost ratio | 14.50% | 14.50% | 16.10% |
General and administrative expense ratio | 14.00% | 13.60% | 14.40% |
Expense ratio | 28.50% | 28.10% | 30.50% |
Combined ratio | 87.90% | 87.50% | 93.00% |
Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net written premiums | $ 1,275.7 | $ 1,098.0 | $ 1,426.4 |
Net earned premiums | 1,305.7 | 1,154.5 | 1,251.8 |
Reserve for losses and loss adjustment expenses | 1,691.5 | 1,373.1 | 1,360.7 |
Net reserve for losses and LAE at the start of the year | $ 1,691.5 | $ 1,373.1 | $ 1,360.7 |
Ratios |  |  |  |
Loss ratio | 56.80% | 52.90% | 61.50% |
Acquisition cost ratio | 17.40% | 18.10% | 20.20% |
General and administrative expense ratio | 10.90% | 10.40% | 11.40% |
Expense ratio | 28.30% | 28.50% | 31.60% |
Combined ratio | 85.10% | 81.40% | 93.10% |
Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net written premiums | $ 1,666.9 | $ 1,483.9 | $ 1,469.6 |
Net earned premiums | 1,584.0 | 1,460.0 | 1,436.9 |
Reserve for losses and loss adjustment expenses | 2,259.1 | 1,859.7 | 1,452.5 |
Net reserve for losses and LAE at the start of the year | $ 2,259.1 | $ 1,859.7 | $ 1,452.5 |
Ratios |  |  |  |
Loss ratio | 61.60% | 64.50% | 63.30% |
Acquisition cost ratio | 12.20% | 11.80% | 12.50% |
General and administrative expense ratio | 16.70% | 16.00% | 17.00% |
Expense ratio | 28.90% | 27.80% | 29.50% |
Combined ratio | 90.50% | 92.30% | 92.80% |
Operating Segments | Reinsurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | $ 1,885.8 | $ 1,521.0 | $ 1,807.0 |
Net written premiums | 1,275.7 | 1,098.0 | 1,426.4 |
Gross earned premiums | 1,822.1 | 1,562.0 | 1,617.2 |
Net earned premiums | 1,305.7 | 1,154.5 | 1,251.8 |
Losses and loss adjustment expenses | 741.3 | 611.1 | 770.3 |
Acquisition costs | 227.0 | 208.6 | 252.4 |
General and administrative expenses | 141.7 | 120.6 | 142.5 |
Underwriting income (loss) | 195.7 | 214.2 | 86.6 |
Operating Segments | Insurance |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Gross written premiums | 2,723.5 | 2,446.6 | 2,531.7 |
Net written premiums | 1,666.9 | 1,483.9 | 1,469.6 |
Gross earned premiums | 2,565.7 | 2,444.8 | 2,370.8 |
Net earned premiums | 1,584.0 | 1,460.0 | 1,436.9 |
Losses and loss adjustment expenses | 976.5 | 941.9 | 909.7 |
Acquisition costs | 193.2 | 171.6 | 179.4 |
General and administrative expenses | 264.2 | 233.9 | 244.0 |
Underwriting income (loss) | $ 150.1 | $ 112.6 | $ 103.8 |

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