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Other Reinsurance Assumed Insurance (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
employees
director
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Assumed Insurance [Line Items]      
Assumed Premiums Earned $ 67.3 $ 60.1 $ 57.1
Capitol [Member]      
Assumed Insurance [Line Items]      
Number of Company Employee Board Members | employees 5    
Number of Board of Director Members | director 5    
ORCC [Member]      
Assumed Insurance [Line Items]      
Number of Company Employee Board Members | employees 9    
Number of Board of Director Members | director 9    
Capitol [Member]      
Assumed Insurance [Line Items]      
Assumed Premiums Earned $ 21.3 21.8 21.9
Capitol [Member] | Trinity [Member]      
Assumed Insurance [Line Items]      
Earned Premiums Assumed, Percentage 100.00%    
ORCC [Member]      
Assumed Insurance [Line Items]      
Assumed Premiums Earned $ 6.2 6.5 6.7
ORCC [Member] | Trinity [Member]      
Assumed Insurance [Line Items]      
Earned Premiums Assumed, Percentage 100.00%    
Non-Catastrophe Reinsurance [Member]      
Assumed Insurance [Line Items]      
Assumed Premiums Earned $ 67.3 $ 60.0 $ 57.1