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Shareholders' Equity (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
unit
Dec. 31, 2009
Jun. 30, 2009
Dec. 31, 2011
unit
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
unit
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
unit
Nov. 14, 2011
Shareholders' Equity                                    
Authorized share capital           $ 5,000,000               $ 5,000,000     $ 5,000,000  
Number of shares authorized           500,000,000       500,000,000       500,000,000 500,000,000   500,000,000  
Par value of shares authorized (in dollar per share)           $ 0.01       $ 0.01       $ 0.01 $ 0.01   $ 0.01  
Issuance of Shares                                    
Number of Shares       27,500,000 44,300,000                       82,400,000  
Price per Share       $ 20.90 $ 11.00                          
Proceeds       575,000,000 487,000,000                          
Net Proceeds       573,800,000 448,900,000                     1,022,096,000 1,271,700,000  
Amount contributed to AGC to satisfy the external capital portion of the rating agency capital initiatives       500,000,000                            
Amount paid to repurchase shares under approved share purchase program     23,311,000                     23,311,000 10,457,000 3,676,000    
Number of shares repurchased     2,000,000                     2,000,000 707,350 1,010,050    
Number of units the Executives in AGC SERP elected to invest in     138,375     68,181               68,181     68,181  
Number of units issuable under each unit in the employer stock fund     138,375     68,181               68,181     68,181  
Number of shares purchased     138,375                              
Value of shares purchased     $ 1,500,000                              
Share repurchases                                    
Number of shares approved to be repurchased under share repurchase program                                   5,000,000
Dividends                                    
Dividends on common stock, per share (in dollars per share) $ 0.09         $ 0.045 $ 0.045 $ 0.045 $ 0.045 $ 0.045 $ 0.045 $ 0.045 $ 0.045 $ 0.18 $ 0.18 $ 0.18    
Increase in common stock dividend (as a percent)                           100.00%        
Dividend paid on common share (in dollars per share)   $ 0.045                                
2010 share repurchase program
                                    
Share repurchases                                    
Number of shares approved to be repurchased under share repurchase program           2,000,000               2,000,000     2,000,000