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Commitments and Contingencies - Narrative (Details)
ft² in Thousands, € in Millions, $ in Millions
1 Months Ended 12 Months Ended
Sep. 23, 2016
USD ($)
step
May 28, 2014
EUR (€)
Dec. 31, 2014
Security
Nov. 30, 2014
USD ($)
Dec. 31, 2016
USD ($)
ft²
Plaintiff
step
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Apr. 10, 2015
USD ($)
Sep. 25, 2013
USD ($)
Nov. 28, 2011
USD ($)
Transaction
Commitments and Contingencies Legal Proceedings                    
Rent expense         $ 13.4 $ 10.5 $ 10.1      
Net Debt Service Outstanding         $ 437,535.0 $ 536,341.0        
AGM [Member]                    
Commitments and Contingencies Legal Proceedings                    
Lease space | ft²         88          
Renewal term         5 years          
Operating lease, beginning rent expense         $ 6.2          
Operating lease, number of step increases in operating lease expense | step         2          
Operating leases, rent expense after step increases, net         $ 7.3          
Operating leases, rent expense after step increases, term         5 years          
LBIE vs. AG Financial Products [Member] | AG Financial Products Inc. [Member] | Guarantee Obligations [Member]                    
Commitments and Contingencies Legal Proceedings                    
Number of credit derivative transactions for which termination payment is alleged to be improperly calculated | Transaction                   9
LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]                    
Commitments and Contingencies Legal Proceedings                    
Number of credit derivative transactions alleged to be improperly terminated | Transaction                   28
Pending Litigation [Member] | Houston Casualty Company Europe Vs Assured Guaranty [Member] | AGC [Member]                    
Commitments and Contingencies Legal Proceedings                    
Termination payments which AG Financial Products and CPT 283 owes to LBHI and LBSF as per calculation of LBHI and LBSF | €   € 15                
Pending Litigation [Member] | Assured Guaranty Municipal Corp And Assured Guaranty US Holdings vs California And New York Government Entities [Member]                    
Commitments and Contingencies Legal Proceedings                    
Number of plaintiffs filing consolidated complaints | Plaintiff         19          
Minimum [Member] | Pending Litigation [Member] | Wells Fargo Bank, N.A., Interpleader Complaint [Member] | AGM [Member]                    
Commitments and Contingencies Legal Proceedings                    
Increase in losses as a result of an adverse outcome, minimum                 $ 10.0  
Maximum [Member] | Pending Litigation [Member] | Wells Fargo Bank, N.A., Interpleader Complaint [Member] | AGM [Member]                    
Commitments and Contingencies Legal Proceedings                    
Increase in losses as a result of an adverse outcome, minimum                 $ 20.0  
Positive Outcome of Litigation [Member] | Pending Litigation [Member] | LBIE vs. AG Financial Products [Member] | AG Financial Products Inc. [Member]                    
Commitments and Contingencies Legal Proceedings                    
Termination payments which LBIE owes to AG Financial Products as per calculation of AG Financial Products                   $ 29.0
Positive Outcome of Litigation [Member] | Pending Litigation [Member] | LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]                    
Commitments and Contingencies Legal Proceedings                    
Termination payments which AG Financial Products owes to LBIE as per calculation of LBIE                   $ 1,400.0
Positive Outcome of Litigation [Member] | Minimum [Member] | LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]                    
Commitments and Contingencies Legal Proceedings                    
Gain contingency, unrecorded amount               $ 200.0    
Positive Outcome of Litigation [Member] | Maximum [Member] | LBIE vs. AG Financial Products [Member] | Lehman Brothers International (Europe) [Member]                    
Commitments and Contingencies Legal Proceedings                    
Gain contingency, unrecorded amount               $ 500.0    
AGM [Member] | New York [Member]                    
Commitments and Contingencies Legal Proceedings                    
Operating lease, number of step increases in operating lease expense | step 2                  
Operating leases, expected annual fixed rent $ 1.1                  
Operating leases, increased annual fixed rent after rent holiday $ 1.3                  
Operating leases, rent term after rent holiday 5 years                  
Residential Mortgage-Backed Securities (RMBS) [Member] | Pending Litigation [Member] | Deutsche Bank National Trust Company Vs Assured Guaranty Corp [Member] | Re-REMIC [Member]                    
Commitments and Contingencies Legal Proceedings                    
Number of insured financial obligations | Security     4              
Net Debt Service Outstanding       $ 70.0            
Proceeds from Sale of Insurance Investments       $ 27.0