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Background and Business Description Rehabilitation Exit Support Agreement (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2014
Jun. 30, 2018
Feb. 12, 2018
Dec. 31, 2017
May 01, 2013
Apr. 30, 2013
Preferred Stock, Shares Outstanding 0       0    
Entity Incorporation, Date of Incorporation Apr. 29, 1991            
satisfaction and discharge of segregated account deferred amounts       $ 3,856,992,000      
Cancellation of Surplus Notes Principal       552,320,000      
Cancellation of Surplus Notes Accrued Interest       257,200,000      
Gain Contingency, Unrecorded Amount     $ 1,400,000,000        
Amount of Senior Surplus Notes Outstanding on June 8, 2020         25.00%    
Common stock, shares authorized 130,000,000       130,000,000    
Common Stock, Par or Stated Value Per Share $ 0.01       $ 0.01   $ 0.01
Preferred stock, shares authorized 20,000,000       20,000,000    
Preferred Stock, Par or Stated Value Per Share $ 0.01       $ 0.01    
Class of Warrant or Right, Exercise Price of Warrants or Rights           $ 16.67  
Common Stock Voting Restrictions   10.00%          
Common Stock Voting Restriction Less One Vote   10.00%          
Common Stock Transfer Restrictions   5.00%          
Common Stock Additional Transfer Restrictions   5.00%          
Minimum surplus amount $ 100,000,000            
Stockholders' Equity Attributable to Noncontrolling Interest 41,150,000       $ 264,110,000    
Market Value of Secured Note Collateral $ 209,983,000            
Ambac Assurance Corporation [Member]              
Preferred Stock, Shares Outstanding 4,115       26,411    
Preferred Stock, Liquidation Preference, Value $ 102,875,000       $ 660,275,000    
Ambac Assurance [Member]              
Secured Notes Received from Ambac LSNI       643,583,000      
Ambac [Member] | Deferred Payment Obligation [Member]              
One Dollar Outstanding       1.00      
Discount Amount       0.09      
Payment Amount in New Secured Notes       0.91      
AFG [Member]              
Amount of Remaining Senior Suplus Notes         $ 60,000,000    
Secured Notes Received from Ambac LSNI       124,881,000      
Ambac LSNI Secured Note [Domain]              
AMBAC LSNI Secured Note       2,154,332,000      
5.1% Surplus Notes, General Account, Due 2020 [Member] | Ambac Assurance Corporation [Member]              
Debt Instrument, Interest Rate, Stated Percentage     5.10%        
Deferred Payment Obligation [Member]              
Discount Amount       0.065      
Surplus Notes [Member]              
Cash Payment Amount       0.40      
Payment Amount in New Secured Notes       0.41      
Payment Amount in Existing Surplus Notes       $ 0.125