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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Segment Reporting [Abstract] |
Reconciliation of operating results by reportable segment | The following table presents operating results by reportable segment for the years ended:
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2013
| Property & Casualty Lines |  | Other (1) |  | Total |  | Property & Casualty Lines |  | Other (1) |  | Total |  | Property & Casualty Lines |  | Other (1) |  | Total
(Amounts in millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ | 2,906.6 |  |  | $ | 51.3 |  |  | $ | 2,957.9 |  |  | $ | 2,737.3 |  |  | $ | 58.9 |  |  | $ | 2,796.2 |  |  | $ | 2,638.4 |  |  | $ | 59.8 |  |  | $ | 2,698.2 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incurred expenses | 2,117.3 |  |  | 28.2 |  |  | 2,145.5 |  |  | 1,951.4 |  |  | 34.7 |  |  | 1,986.1 |  |  | 1,926.4 |  |  | 36.3 |  |  | 1,962.7 |
Underwriting expenses | 770.0 |  |  | 20.0 |  |  | 790.0 |  |  | 749.7 |  |  | 25.9 |  |  | 775.6 |  |  | 701.0 |  |  | 23.9 |  |  | 724.9 |
Underwriting gain | 19.3 |  |  | 3.1 |  |  | 22.4 |  |  | 36.2 |  |  | (1.7 | ) |  | 34.5 |  |  | 11.0 |  |  | (0.4 | ) |  | 10.6 |
Investment income |  |  |  |  | 126.3 |  |  |  |  |  |  | 125.7 |  |  |  |  |  |  | 124.5 |
Net realized investment (losses) gains |  |  |  |  | (83.8 | ) |  |  |  |  |  | 81.1 |  |  |  |  |  |  | (11.4 | )
Other income |  |  |  |  | 8.9 |  |  |  |  |  |  | 8.7 |  |  |  |  |  |  | 9.7 |
Interest expense |  |  |  |  | (3.2 | ) |  |  |  |  |  | (2.6 | ) |  |  |  |  |  | (1.3 | )
Pre-tax income |  |  |  |  | $ | 70.6 |  |  |  |  |  |  | $ | 247.4 |  |  |  |  |  |  | $ | 132.1 |
Net income |  |  |  |  |  |  | $ | 74.5 |  |  |  |  |  |  | $ | 177.9 |  |  |  |  |  |  | $ | 112.1 |
Schedule direct premiums attributable to segment | The following table presents the Company’s direct premiums written and net premiums earned by line of insurance business for the years ended:
| December 31, 2015 |  | December 31, 2014 |  | December 31, 2013
| Property & Casualty Lines |  | Other (1) |  | Total |  | Property & Casualty Lines |  | Other (1) |  | Total |  | Property & Casualty Lines |  | Other (1) |  | Total
(Amounts in millions) |  |  |  |  |  |  |  |  |  |  |  |  |
Private passenger automobile | $ | 2,345.8 |  |  | $ | — |  |  | $ | 2,345.8 |  |  | $ | 2,223.1 |  |  | $ | — |  |  | $ | 2,223.1 |  |  | $ | 2,165.6 |  |  | $ | — |  |  | $ | 2,165.6 |
Homeowners | 402.2 |  |  | — |  |  | 402.2 |  |  | 374.5 |  |  | — |  |  | 374.5 |  |  | 340.0 |  |  | — |  |  | 340.0 |
Commercial automobile | 153.5 |  |  | — |  |  | 153.5 |  |  | 135.9 |  |  | — |  |  | 135.9 |  |  | 104.7 |  |  | — |  |  | 104.7 |
Other | 81.6 |  |  | 29.8 |  |  | 111.4 |  |  | 75.4 |  |  | 44.3 |  |  | 119.7 |  |  | 64.4 |  |  | 62.8 |  |  | 127.2 |
Direct premiums written | $ | 2,983.1 |  |  | $ | 29.8 |  |  | $ | 3,012.9 |  |  | $ | 2,808.9 |  |  | $ | 44.3 |  |  | 2,853.2 |  |  | $ | 2,674.7 |  |  | $ | 62.8 |  |  | $ | 2,737.5 |
Private passenger automobile | $ | 2,308.6 |  |  | $ | — |  |  | $ | 2,308.6 |  |  | $ | 2,203.0 |  |  | $ | — |  |  | $ | 2,203.0 |  |  | $ | 2,163.4 |  |  | $ | — |  |  | $ | 2,163.4 |
Homeowners | 379.7 |  |  | — |  |  | 379.7 |  |  | 347.9 |  |  | — |  |  | 347.9 |  |  | 328.5 |  |  | — |  |  | 328.5 |
Commercial automobile | 144.4 |  |  | — |  |  | 144.4 |  |  | 121.8 |  |  | — |  |  | 121.8 |  |  | 88.3 |  |  | — |  |  | 88.3 |
Other | 73.9 |  |  | 51.3 |  |  | 125.2 |  |  | 64.6 |  |  | 58.9 |  |  | 123.5 |  |  | 58.2 |  |  | 59.8 |  |  | 118.0 |
Net premiums earned | $ | 2,906.6 |  |  | $ | 51.3 |  |  | $ | 2,957.9 |  |  | $ | 2,737.3 |  |  | $ | 58.9 |  |  | $ | 2,796.2 |  |  | $ | 2,638.4 |  |  | $ | 59.8 |  |  | $ | 2,698.2 |
__________
(1) | "Other" represents net premiums written and earned from an operating segment that does not meet the quantitative thresholds required to be considered a reportable segment. This operating segment offers automobile mechanical breakdown warranties which are sold through auto dealerships and credit unions.

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, and discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 + Details
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