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Insurance Company Regulatory Requirements (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
AGC
Maryland
Jun. 30, 2010
AGC
Maryland
Jun. 30, 2011
AGM
New York
Y
Jun. 30, 2011
Bermuda
AG Re and AGRO
D
Jun. 30, 2011
Bermuda
AG Re
Dividend Restrictions and Capital Requirements          
Amount available for distribution $ 106.6   $ 130.4   $ 1,150.0
Dividend declared and paid $ 10.0 $ 30.0     $ 24.0
Period of dividend non-payment (in years)     2    
Dividend restrictions on statutory capital (as a percent)       15.00%  
Relevant assets as a percentage of relevant liabilities (as a percent)       75.00%  
Dividend restrictions on statutory capital and surplus (as a percent)       25.00%  
Period for filing affidavit prior to dividend payment (in days)       7