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Insurance Company Regulatory Requirements - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
Affiliated Entity [Member] | Municipal Assurance Corp [Member] | AGM [Member]  
Statutory Accounting Practices [Line Items]  
Statutory Accounting Practices, Intercompany Transaction, Consideration Transferred $ 102.5
Affiliated Entity [Member] | AGC [Member] | Municipal Assurance Corp Holdings [Member]  
Statutory Accounting Practices [Line Items]  
Ownership percentage by noncontrolling owners 39.30%
Statutory Accounting Practices, Intercompany Transaction, Proceeds From Repayment Of Surplus Notes $ 117.9
Affiliated Entity [Member] | AGM [Member] | Municipal Assurance Corp Holdings [Member]  
Statutory Accounting Practices [Line Items]  
Noncontrolling Interest, Ownership Percentage by Parent 60.70%
Statutory Accounting Practices, Intercompany Transaction, Proceeds From Repayment Of Surplus Notes $ 182.1
New York [Member] | AGM [Member]  
Statutory Accounting Practices [Line Items]  
Threshold for dividend payments as a percentage of policyholder surplus 10.00%
Threshold for dividend payments, percentage of adjusted net investment income 100.00%
Amount available for distribution, current year $ 244.0
Amount available for distribution, next fiscal quarter $ 65.0
Maryland [Member] | AGC [Member]  
Statutory Accounting Practices [Line Items]  
Threshold for dividend payments as a percentage of policyholder surplus 10.00%
Threshold for dividend payments, percentage of adjusted net investment income 100.00%
Amount available for distribution, next fiscal quarter $ 16.0
Maryland [Member] | AGUS [Member] | AGC [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year 79.0
Bermuda [Member] | Assured Guaranty Re [Member]  
Statutory Accounting Practices [Line Items]  
Amount available for distribution, current year $ 246.0
Dividend payment restrictions schedule, percentage of statutory capital 15.00%
Dividend payment restrictions schedule amount of statutory capital $ 127.0
Dividend restrictions on statutory capital and surplus (as a percent) 25.00%
Statutory surplus $ 223.0
Unencumbered assets $ 580.0