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Accounting Policies (Tables)
 12 Months Ended
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