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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Reconciliation of operating results by reportable segment | The following tables present the Company's operating results by reportable segment:
| Three Months Ended June 30,
| 2018 |  | 2017
| Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total
| (Amounts in millions)
Net premiums earned | $ | 826.2 |  |  | $ | 7.8 |  |  | $ | 834.0 |  |  | $ | 789.0 |  |  | $ | 8.7 |  |  | $ | 797.7 |
Less: |  |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment expenses | 601.5 |  |  | 4.0 |  |  | 605.5 |  |  | 584.2 |  |  | 4.4 |  |  | 588.6 |
Underwriting expenses | 198.7 |  |  | 3.8 |  |  | 202.5 |  |  | 187.4 |  |  | 4.0 |  |  | 191.4 |
Underwriting gain | 26.0 |  |  | — |  |  | 26.0 |  |  | 17.4 |  |  | 0.3 |  |  | 17.7 |
Investment income |  |  |  |  | 34.8 |  |  |  |  |  |  | 31.9 |
Net realized investment gains |  |  |  |  | 14.3 |  |  |  |  |  |  | 21.2 |
Other income |  |  |  |  | 2.4 |  |  |  |  |  |  | 2.1 |
Interest expense |  |  |  |  | (4.3 | ) |  |  |  |  |  | (4.2 | )
Pre-tax income |  |  |  |  | $ | 73.2 |  |  |  |  |  |  | $ | 68.8 |
Net income |  |  |  |  | $ | 60.2 |  |  |  |  |  |  | $ | 51.6 |
| Six Months Ended June 30,
| 2018 |  | 2017
| Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total
| (Amounts in millions)
Net premiums earned | $ | 1,626.4 |  |  | $ | 15.6 |  |  | $ | 1,642.0 |  |  | $ | 1,569.7 |  |  | $ | 17.7 |  |  | $ | 1,587.4 |
Less: |  |  |  |  |  |  |  |  |  |  |
Losses and loss adjustment expenses | 1,229.9 |  |  | 7.9 |  |  | 1,237.8 |  |  | 1,186.0 |  |  | 9.3 |  |  | 1,195.3 |
Underwriting expenses | 401.2 |  |  | 7.6 |  |  | 408.8 |  |  | 391.0 |  |  | 7.9 |  |  | 398.9 |
Underwriting (loss) gain | (4.7 | ) |  | 0.1 |  |  | (4.6 | ) |  | (7.3 | ) |  | 0.5 |  |  | (6.8 | )
Investment income |  |  |  |  | 66.3 |  |  |  |  |  |  | 63.1 |
Net realized investment (losses) gains |  |  |  |  | (44.4 | ) |  |  |  |  |  | 45.6 |
Other income |  |  |  |  | 4.7 |  |  |  |  |  |  | 4.2 |
Interest expense |  |  |  |  | (8.5 | ) |  |  |  |  |  | (6.7 | )
Pre-tax income |  |  |  |  | $ | 13.5 |  |  |  |  |  |  | $ | 99.4 |
Net income |  |  |  |  | $ | 17.6 |  |  |  |  |  |  | $ | 78.6 |
Schedule direct premiums attributable to segment | The following tables present the Company’s net premiums earned and direct premiums written by line of insurance business:
| Three Months Ended June 30,
| 2018 |  | 2017
| Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total
| (Amounts in millions)
Private passenger automobile | $ | 645.6 |  |  | $ | — |  |  | $ | 645.6 |  |  | $ | 617.3 |  |  | $ | — |  |  | $ | 617.3 |
Homeowners | 112.7 |  |  | — |  |  | 112.7 |  |  | 108.3 |  |  | — |  |  | 108.3 |
Commercial automobile | 46.7 |  |  | — |  |  | 46.7 |  |  | 42.4 |  |  | — |  |  | 42.4 |
Other | 21.2 |  |  | 7.8 |  |  | 29.0 |  |  | 21.0 |  |  | 8.7 |  |  | 29.7 |
Net premiums earned | $ | 826.2 |  |  | $ | 7.8 |  |  | $ | 834.0 |  |  | $ | 789.0 |  |  | $ | 8.7 |  |  | $ | 797.7 |
Private passenger automobile | $ | 666.0 |  |  | $ | — |  |  | $ | 666.0 |  |  | $ | 600.1 |  |  | $ | — |  |  | $ | 600.1 |
Homeowners | 138.0 |  |  | — |  |  | 138.0 |  |  | 122.7 |  |  | — |  |  | 122.7 |
Commercial automobile | 49.9 |  |  | — |  |  | 49.9 |  |  | 45.1 |  |  | — |  |  | 45.1 |
Other | 25.5 |  |  | 7.2 |  |  | 32.7 |  |  | 24.2 |  |  | 8.5 |  |  | 32.7 |
Direct premiums written | $ | 879.4 |  |  | $ | 7.2 |  |  | $ | 886.6 |  |  | $ | 792.1 |  |  | $ | 8.5 |  |  | $ | 800.6 |
| Six Months Ended June 30,
| 2018 |  | 2017
| Property & Casualty |  | Other |  | Total |  | Property & Casualty |  | Other |  | Total
| (Amounts in millions)
Private passenger automobile | $ | 1,272.5 |  |  | $ | — |  |  | $ | 1,272.5 |  |  | $ | 1,230.5 |  |  | $ | — |  |  | $ | 1,230.5 |
Homeowners | 220.5 |  |  | — |  |  | 220.5 |  |  | 214.0 |  |  | — |  |  | 214.0 |
Commercial automobile | 91.6 |  |  | — |  |  | 91.6 |  |  | 83.7 |  |  | — |  |  | 83.7 |
Other | 41.8 |  |  | 15.6 |  |  | 57.4 |  |  | 41.5 |  |  | 17.7 |  |  | 59.2 |
Net premiums earned | $ | 1,626.4 |  |  | $ | 15.6 |  |  | $ | 1,642.0 |  |  | $ | 1,569.7 |  |  | $ | 17.7 |  |  | $ | 1,587.4 |
Private passenger automobile | $ | 1,340.0 |  |  | $ | — |  |  | $ | 1,340.0 |  |  | $ | 1,239.1 |  |  | $ | — |  |  | $ | 1,239.1 |
Homeowners | 253.3 |  |  | — |  |  | 253.3 |  |  | 226.5 |  |  | — |  |  | 226.5 |
Commercial automobile | 99.6 |  |  | — |  |  | 99.6 |  |  | 88.1 |  |  | — |  |  | 88.1 |
Other | 49.1 |  |  | 13.6 |  |  | 62.7 |  |  | 47.0 |  |  | 14.2 |  |  | 61.2 |
Direct premiums written | $ | 1,742.0 |  |  | $ | 13.6 |  |  | $ | 1,755.6 |  |  | $ | 1,600.7 |  |  | $ | 14.2 |  |  | $ | 1,614.9 |

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