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v3.23.1

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, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Gross written premiums | $ 4,338.7 |  | $ 3,938.4 | $ 3,698.5 |
Net written premiums | 2,896.0 |  | 2,587.7 | 2,577.8 |
Gross earned premiums | 3,988.0 |  | 3,618.3 | 3,638.4 |
Net earned premiums | 2,688.7 |  | 2,410.5 | 2,527.5 |
Losses and loss adjustment expenses | 1,680.0 |  | 1,693.3 | 1,840.8 |
Acquisition costs | 431.8 |  | 414.1 | 465.7 |
General and administrative expenses | 386.5 |  | 333.1 | 308.0 |
Underwriting income (loss) | 190.4 |  | (30.0) | (87.0) |
Corporate Expenses | (71.7) |  | (64.3) | (70.2) |
Non-operating expenses (1) | (36.0) |  | (20.6) | (32.7) |
Net investment income (1) | 188.1 | [1] | 147.5 | 154.6 |
Realized and unrealized investment gains | 5.0 | [2] | 56.2 | 98.5 |
Realized and unrealized investment losses | (182.6) | [3] | (47.4) | (27.4) |
Change in fair value of derivatives | (80.5) |  | (35.9) | (65.1) |
Interest Expense, Debt | (43.7) |  | (14.3) | (33.9) |
Net realized and unrealized foreign exchange gains | 15.9 |  | 40.0 | (13.8) |
Other income | 8.2 |  | 14.7 | 49.8 |
Other expenses | 20.1 |  | 10.8 | 10.8 |
Income (loss) from operations before income taxes | (27.0) |  | 35.1 | (38.0) |
Income Tax Expense (Benefit) | 78.1 |  | (5.3) | (18.4) |
Net income/(loss) | 51.1 |  | 29.8 | (56.4) |
Losses and loss adjustment expenses | 7,710.9 |  | 7,611.8 | 7,165.3 | $ 6,951.8
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total | $ 2,813.2 |  | $ 4,313.7 | $ 3,970.1 | $ 4,632.0
Ratios |  |  |  |  |
Loss ratio | 62.50% |  | 70.20% | 72.80% |
Acquisition cost ratio | 16.10% |  | 17.20% | 18.40% |
General and administrative expense ratio | 14.40% |  | 13.80% | 12.20% |
Expense ratio | 30.50% |  | 31.00% | 30.60% |
Combined ratio | 93.00% |  | 101.20% | 103.40% |
Non-operating expenses related to fixed income writeoff | $ 32.7 |  |  |  |
Non-operating expenses related to severance, retention awards and other non-recurring costs | 10.0 |  |  | $ 18.2 |
Non-operating expenses related to impairment charges on lease assets | 6.7 |  | $ 0.4 | 12.9 |
Non-operating expenses related to Merger Agreement |  |  | 19.3 |  |
Non-operating expenses related to Effectiveness And Efficiency Program |  |  | 0.9 | 1.6 |
Reinsurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net written premiums | 1,426.4 |  | 1,199.0 | 1,297.7 |
Net earned premiums | 1,251.8 |  | 1,118.8 | 1,287.7 |
Losses and loss adjustment expenses | 1,360.7 |  | 2,148.4 | 2,095.7 |
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total | $ 1,360.7 |  | $ 2,148.4 | $ 2,095.7 |
Ratios |  |  |  |  |
Loss ratio | 61.50% |  | 63.00% | 74.40% |
Acquisition cost ratio | 20.20% |  | 19.80% | 19.10% |
General and administrative expense ratio | 11.40% |  | 10.80% | 8.60% |
Expense ratio | 31.60% |  | 30.60% | 27.70% |
Combined ratio | 93.10% |  | 93.60% | 102.10% |
Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net written premiums | $ 1,469.6 |  | $ 1,388.7 | $ 1,280.1 |
Net earned premiums | 1,436.9 |  | 1,291.7 | 1,239.8 |
Losses and loss adjustment expenses | 1,452.5 |  | 2,165.3 | 1,874.4 |
Liability for Unpaid Claims and Claims Adjustment Expense, Net, Total | $ 1,452.5 |  | $ 2,165.3 | $ 1,874.4 |
Ratios |  |  |  |  |
Loss ratio | 63.30% |  | 76.50% | 71.10% |
Acquisition cost ratio | 12.50% |  | 14.90% | 17.70% |
General and administrative expense ratio | 17.00% |  | 16.40% | 15.90% |
Expense ratio | 29.50% |  | 31.30% | 33.60% |
Combined ratio | 92.80% |  | 107.80% | 104.70% |
Operating Segments | Reinsurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross written premiums | $ 1,807.0 |  | $ 1,597.0 | $ 1,656.4 |
Net written premiums | 1,426.4 |  | 1,199.0 | 1,297.7 |
Gross earned premiums | 1,617.2 |  | 1,479.2 | 1,612.0 |
Net earned premiums | 1,251.8 |  | 1,118.8 | 1,287.7 |
Losses and loss adjustment expenses | 770.3 |  | 705.2 | 958.6 |
Acquisition costs | 252.4 |  | 221.6 | 246.0 |
General and administrative expenses | 142.5 |  | 121.3 | 110.8 |
Underwriting income (loss) | 86.6 |  | 70.7 | (27.7) |
Operating Segments | Insurance |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Gross written premiums | 2,531.7 |  | 2,341.4 | 2,042.1 |
Net written premiums | 1,469.6 |  | 1,388.7 | 1,280.1 |
Gross earned premiums | 2,370.8 |  | 2,139.1 | 2,026.4 |
Net earned premiums | 1,436.9 |  | 1,291.7 | 1,239.8 |
Losses and loss adjustment expenses | 909.7 |  | 988.1 | 882.2 |
Acquisition costs | 179.4 |  | 192.5 | 219.7 |
General and administrative expenses | 244.0 |  | 211.8 | 197.2 |
Underwriting income (loss) | $ 103.8 |  | $ (100.7) | $ (59.3) |
[1] | Net investment income includes related party investment income of $3.1 million and related party investment management fees of $4.9 million (2021 — $5.8 million, 2020 — $5.3 million).
[2] |
[3] | Realized and unrealized investments losses includes $0.4 million loss on related party investments

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