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Segment Information Underwriting Margins and Combined Ratios for our Underwriting Operations (Details) - Underwriting Operations | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Personal Lines Segment | Agency Channel |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin |  | 7.50% | 5.00% | 7.80%
Combined Ratio |  | 92.50% | 95.00% | 92.20%
Personal Lines Segment | Direct Channel |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin |  | 6.30% | 4.40% | 4.90%
Combined Ratio |  | 93.70% | 95.60% | 95.10%
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin |  | 6.60% | 4.90% | 7.50%
Combined Ratio |  | 93.40% | 95.10% | 92.50%
Operating Segments | Personal Lines Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin |  | 6.90% | 4.70% | 6.50%
Combined Ratio |  | 93.10% | 95.30% | 93.50%
Operating Segments | Commercial Lines Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin |  | 7.70% | 6.40% | 15.90%
Combined Ratio |  | 92.30% | 93.60% | 84.10%
Operating Segments | Property Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Underwriting Margin |  | (5.10%) | 3.80% | 10.10%
Combined Ratio |  | 105.10% | 96.20% | 89.90%
Combined ratio amortization points | 0.077 | 0.067 | 0.072 |

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