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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2022
Segment Reporting [Abstract] |
Reconciliation of operating results by reportable segment | The following table presents operating results by reportable segment for the years ended:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total
| (Amounts in millions)
Net premiums earned | $ | 3,923.6 |  |  | $ | 28.9 |  |  | $ | 3,952.5 |  |  | $ | 3,712.9 |  |  | $ | 29.0 |  |  | $ | 3,741.9 |  |  | $ | 3,526.8 |  |  | $ | 28.8 |  |  | $ | 3,555.6 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment expenses | 3,347.2 |  |  | 15.0 |  |  | 3,362.2 |  |  | 2,746.3 |  |  | 13.9 |  |  | 2,760.2 |  |  | 2,381.5 |  |  | 13.8 |  |  | 2,395.3 |
Underwriting expenses | 922.1 |  |  | 12.3 |  |  | 934.4 |  |  | 902.6 |  |  | 14.1 |  |  | 916.7 |  |  | 899.1 |  |  | 14.6 |  |  | 913.7 |
Underwriting (loss) gain | (345.7) |  |  | 1.6 |  |  | (344.1) |  |  | 64.0 |  |  | 1.0 |  |  | 65.0 |  |  | 246.2 |  |  | 0.4 |  |  | 246.6 |
Investment income |  |  |  |  | 168.4 |  |  |  |  |  |  | 129.7 |  |  |  |  |  |  | 134.9 |
Net realized investment (losses) gains |  |  |  |  | (488.1) |  |  |  |  |  |  | 111.7 |  |  |  |  |  |  | 85.7 |
Other income |  |  |  |  | 10.3 |  |  |  |  |  |  | 10.0 |  |  |  |  |  |  | 8.3 |
Interest expense |  |  |  |  | (17.2) |  |  |  |  |  |  | (17.1) |  |  |  |  |  |  | (17.0) |
Pre-tax (loss) income |  |  |  |  | $ | (670.7) |  |  |  |  |  |  | $ | 299.3 |  |  |  |  |  |  | $ | 458.5 |
Net (loss) income |  |  |  |  | $ | (512.7) |  |  |  |  |  |  | $ | 247.9 |  |  |  |  |  |  | $ | 374.6 |
Schedule direct premiums attributable to segment | The following table presents the Company’s net premiums earned and direct premiums written by line of insurance business for the years ended:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
| Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total
| (Amounts in millions)
Private passenger automobile | $ | 2,655.7 |  |  | $ | — |  |  | $ | 2,655.7 |  |  | $ | 2,613.5 |  |  | $ | — |  |  | $ | 2,613.5 |  |  | $ | 2,591.3 |  |  | $ | — |  |  | $ | 2,591.3 |
Homeowners | 830.6 |  |  | — |  |  | 830.6 |  |  | 698.1 |  |  | — |  |  | 698.1 |  |  | 601.3 |  |  | — |  |  | 601.3 |
Commercial automobile | 267.9 |  |  | — |  |  | 267.9 |  |  | 258.6 |  |  | — |  |  | 258.6 |  |  | 225.6 |  |  | — |  |  | 225.6 |
Other | 169.4 |  |  | 28.9 |  |  | 198.3 |  |  | 142.7 |  |  | 29.0 |  |  | 171.7 |  |  | 108.6 |  |  | 28.8 |  |  | 137.4 |
Net premiums earned | $ | 3,923.6 |  |  | $ | 28.9 |  |  | $ | 3,952.5 |  |  | $ | 3,712.9 |  |  | $ | 29.0 |  |  | $ | 3,741.9 |  |  | $ | 3,526.8 |  |  | $ | 28.8 |  |  | $ | 3,555.6 |
Private passenger automobile | $ | 2,598.9 |  |  | $ | — |  |  | $ | 2,598.9 |  |  | $ | 2,640.7 |  |  | $ | — |  |  | $ | 2,640.7 |  |  | $ | 2,569.0 |  |  | $ | — |  |  | $ | 2,569.0 |
Homeowners | 940.3 |  |  | — |  |  | 940.3 |  |  | 801.5 |  |  | — |  |  | 801.5 |  |  | 678.9 |  |  | — |  |  | 678.9 |
Commercial automobile | 276.8 |  |  | — |  |  | 276.8 |  |  | 259.9 |  |  | — |  |  | 259.9 |  |  | 240.8 |  |  | — |  |  | 240.8 |
Other | 202.1 |  |  | 30.4 |  |  | 232.5 |  |  | 175.4 |  |  | 30.0 |  |  | 205.4 |  |  | 136.3 |  |  | 29.2 |  |  | 165.5 |
Direct premiums written | $ | 4,018.1 |  |  | $ | 30.4 |  |  | $ | 4,048.5 |  |  | $ | 3,877.5 |  |  | $ | 30.0 |  |  | $ | 3,907.5 |  |  | $ | 3,625.0 |  |  | $ | 29.2 |  |  | $ | 3,654.2 |

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