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Other Reinsurance Assumed Insurance (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Capitol [Member]
employees
director
Dec. 31, 2013
ORCC [Member]
employees
director
Dec. 31, 2013
Capitol [Member]
Dec. 31, 2012
Capitol [Member]
Dec. 31, 2011
Capitol [Member]
Sep. 30, 2012
Capitol [Member]
Trinity [Member]
Dec. 31, 2013
Capitol [Member]
Trinity [Member]
Dec. 31, 2013
ORCC [Member]
Dec. 31, 2012
ORCC [Member]
Dec. 31, 2011
ORCC [Member]
Dec. 31, 2013
ORCC [Member]
Trinity [Member]
Dec. 31, 2013
Non-Catastrophe Reinsurance [Member]
Dec. 31, 2012
Non-Catastrophe Reinsurance [Member]
Dec. 31, 2011
Non-Catastrophe Reinsurance [Member]
Assumed Insurance [Line Items]                                  
Assumed Premiums Earned $ 52.7 $ 44.0 $ 43.7     $ 22.4 $ 25.0 $ 27.9     $ 7.2 $ 8.2 $ 9.0   $ 52.7 $ 44.0 $ 43.7
Earned Premiums Assumed, Percentage                   100.00%       100.00%      
Change in Policyholder Benefits and Incurred Losses and LAE as Result of Quota Share Revision                 $ (2.6)                
Number of Company Employee Board Members       5 9                        
Number of Board of Director Members       5 9