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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2015
Accounting Policies [Abstract] |
Schedule of intangible assets | The following table provides additional information regarding ProAssurance's intangible assets.
| Gross Carrying Value |  | Accumulated Amortization |  | Amortization Expense
| December 31 |  | December 31 |  | Year Ended December 31
(In millions) | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2013
Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Non-amortizable | $ | 25.8 |  |  | $ | 25.8 |  |  |  |  |  |  |  |  |  |  |
Amortizable | 94.0 |  |  | 96.2 |  |  | $ | 27.3 |  |  | $ | 21.2 |  |  | $ | 8.3 |  |  | $ | 10.3 |  |  | $ | 5.3 |
Total Intangible Assets | $ | 119.8 |  |  | $ | 122.0 |  |  |  |  |  |  |  |  |  |  |
Aggregate amortization expense for intangible assets is estimated to be $8.1 million for the year ended December 31, 2016 and $5.6 million for each of the years ended December 31, 2017, 2018, 2019 and 2020.
Other liabilities | Other liabilities at December 31, 2015 and 2014 consisted of the following:
(In millions) |  | 2015 |  | 2014
SPC dividends payable |  | $ | 16.7 |  |  | $ | 15.8 |
Liability for unpaid dividends |  | 69.4 |  |  | 167.7 |
Remaining other liabilities |  | 116.2 |  |  | 137.4 |
Total Other liabilities |  | $ | 202.3 |  |  | $ | 320.9 |

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