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Shareholders' Equity (Narrative) (Details) (USD $)
5 Months Ended 1 Months Ended 3 Months Ended 5 Months Ended 9 Months Ended 1 Months Ended 5 Months Ended
Jun. 30, 2013
May 1, 2013 Alterra Capital Holdings [Member]
Sep. 30, 2013
Warrant [Member]
May 1, 2013 Alterra Capital Holdings [Member]
warrant_holders
May 31, 2013
2012 Compensation Plan [Member]
Restricted Stock Units (RSUs) [Member]
Retention [Member]
Executive Officer [Member]
May 31, 2013
Alterra Equity Award Plans [Member]
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Alterra Equity Award Plans [Member]
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Alterra Equity Award Plans [Member]
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2013
Alterra Equity Award Plans [Member]
Restricted Stock Units (RSUs) [Member]
May 31, 2013
Alterra Equity Award Plans [Member]
Stock Options [Member]
Sep. 30, 2013
Alterra Equity Award Plans [Member]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of restricted stock units awarded     31,669            
Restricted stock awards, grant date fair value     $ 16,600,000     $ 81,600,000      
Restricted stock awards, vesting period     3 years            
Number of shares of common stock issuable for each vested restricted stock unit     1            
Number of awards issued       154,103       101,875  
Weighted average exercise price of replacement options issued                 $ 398.96
Weighted average grant-date fair value of replacement options issued                 $ 140.08
Expected annual volatility, assumption used in pricing model                 19.04%
Risk free rate, assumption used in pricing model                 0.20%
Expected term, assumption used in pricing model                 2 years
Number of options exercised under option plans                 49,763
Cash proceeds resulting from exercise of stock options                 18,500,000
Current tax benefits resulting from exercise of stock options                 700,000
Intrinsic value of options exercised                 6,400,000
Weighted average grant-date fair value of restricted stock awards           $ 529.59      
Weighted average remaining service period of restricted stock awards           1 year 1 year    
Recognized compensation expense related to vested restricted stock awards as of the acquisition date           (61,000,000)      
Unrecognized compensation on unvested restricted stock and restricted stock units (20,572,000)       (20,600,000) (20,600,000) (20,600,000)    
Recognized compensation expense related to restricted stock awards         (1,500,000)   (10,900,000)    
Unrecognized compensation cost related to nonvested restricted stock awards         (6,500,000) (6,500,000) (6,500,000)    
Fair value of the vested restricted stock awards             40,400,000    
Number of Company Converted Warrants issued   225,529              
Fair value of Company Converted Warrants   $ 73,700,000              
Number of warrant holders who elected to have their warrants remain outstanding   3              
Number of Company Converted Warrants exercised   225,499              
Number of shares of the Company's common stock stock warrant holders received under the cashless exercise provision of warrants   100,115              
Number of shares of the Company's common stock available for purchase related to outstanding warrants   30